The National Museum of Natural History is a natural-history museum administered by the Smithsonian Institution , located on the National Mall in Washington, D.C. , United States . It has free admission and is open 364 days a year. In 2016, with 7.1 million visitors, it was the fourth most visited museum in the world and the most visited natural-history museum in the world. Opened in 1910, the museum on the National Mall was one of the first Smithsonian buildings constructed exclusively to hold the national collections and research facilities.  The main building has an overall area of 1,500,000 square feet (140,000 m 2 ) with 325,000 square feet (30,200 m 2 ) of exhibition and public space and houses over 1,000 employees. 
The museum's collections contain over 126 million specimens  of plants , animals , fossils , minerals , rocks , meteorites , human remains, and human cultural artifacts . In 2016 it was the second most visited of all of the Smithsonian museums. It is also home to about 185 professional natural-history scientists — the largest group of scientists dedicated to the study of natural and cultural history in the world.
The United States National Museum was founded in 1846 as part of the Smithsonian Institution. The museum was initially housed in the Smithsonian Institution Building , which is better known today as the Smithsonian Castle. A formal exhibit hall opened in 1858. The growing collection led to the construction of a new building, the National Museum Building (known today as the Arts and Industries Building ). Covering a then-enormous 2.25 acres (9,100 m 2 ), it was built in just 15 months at a cost of $310,000. It opened in March 1881.
Congress authorized construction of a new building on June 28, 1902. On January 29, 1903, a special committee composed of members of Congress and representatives from the Smithsonian's board of regents published a report asking Congress to fund a much larger structure than originally planned. The regents began considering sites for the new building in March, and by April 12 settled on a site on the north side of B Street NW between 9th and 12th Streets. The D.C. architectural firm of Hornblower & Marshall was chosen to design the structure. Testing of the soil for the foundations was set for July 1903, with construction expected to take three years.
The Natural History Building (as the National Museum of Natural History was originally known) opened its doors to the public on March 17, 1910, in order to provide the Smithsonian Institution with more space for collections and research.  The building was not fully completed until June 1911.  The structure cost $3.5 million (about $85 million in inflation-adjusted 2012) dollars. The Neoclassical style building was the first structure constructed on the north side of the National Mall as part of the 1901 McMillan Commission plan. In addition to the Smithsonian's natural history collection, it also housed the American history, art, and cultural collections.
Between 1981 and 2003, the National Museum of Natural History had 11 permanent and acting directors. There were six directors alone between 1990 and 2002. Turnover was high as the museum's directors were disenchanted by low levels of funding and the Smithsonian's inability to clearly define the museum's mission. Robert W. Fri was named the museum's director in 1996. One of the largest donations in Smithsonian history was made during Fri's tenure. Kenneth E. Behring donated $20 million in 1997 to modernize the museum. Fri resigned in 2001 after disagreeing with Smithsonian leadership over the reorganization of the museum's scientific research programs.
J. Dennis O'Connor , Provost of the Smithsonian Institution (where he oversaw all science and research programs) was named acting director of the museum on July 25, 2001. Eight months later, O'Conner resigned to become the vice president of research and dean of the graduate school at the University of Maryland . Douglas Erwin , a paleontologist at the National Museum of Natural History, was appointed interim director in June 2002.
In January 2003, the Smithsonian announced that Cristián Samper , a Colombian with an M.Sc. and Ph.D. from Harvard University , would become the museum's permanent director on March 31, 2003. Samper (who holds dual citizenship with Colombia and the United States) founded the Alexander von Humboldt Biological Resources Research Institute and ran the Smithsonian Tropical Research Institute after 2001. Smithsonian officials said Samper's administrative experience proved critical in his appointment. Under Samper's direction, the museum opened the $100 million Behring Hall of Mammals in November 2003, received $60 million in 2004 for the Sant Hall of Oceans, and received a $1 million gift from Tiffany & Co. for the purchase of precious gems for the National Gem Collection.
On March 25, 2007, Lawrence M. Small , Secretary of the Smithsonian Institution and the organization's highest-ranking appointed official, resigned abruptly after public reports of lavish spending.
On March 27, 2007 Samper was appointed Acting Secretary of the Smithsonian. Paul G. Risser , former chancellor of the University of Oklahoma, was named Acting Director of the Museum of Natural History on March 29.
Samper's tenure at the museum was not without controversy. In May 2007, Robert Sullivan, the former associate director in charge of exhibitions at the National Museum of Natural History, charged that Samper and Smithsonian Undersecretary for Science David Evans (Samper's supervisor) ordered "last minute" changes in the exhibit "Arctic: A Friend Acting Strangely" to tone down the role of human beings in the discussion of global warming , and to make global warming seem more uncertain than originally depicted. Samper denied that he knew of any scientific objections to the changes, and said that no political pressure had been applied to the Smithsonian to make the changes. In November 2007, The Washington Post reported that an interagency group of scientists from the Department of the Interior , NASA , National Oceanic and Atmospheric Administration (NOAA), and National Science Foundation believed that, despite Samper's denial, the museum "acted to avoid criticism from congressional appropriators and global-warming skeptics in the Bush administration". The changes were discussed as early as mid-August 2005, and Dr. Waleed Abdalati , manager of NASA's Cryospheric Sciences Program, noted at the time that "There was some discussion of the political sensitivities of the exhibit." Although the exhibit was due to open in October 2005, the Post reported that Samper ordered a six-month delay to allow for even further changes. The newspaper also reported that it had obtained a memo drafted by Samper shortly after October 15, 2005, in which Samper said the museum should not "replicate" work by the Intergovernmental Panel on Climate Change . A few weeks later, a NOAA climate researcher advised a superior that the delay was due to "the debate within the administration and the science community over the existence and cause of global warming". During the delay, Samper asked high-level officials in other government agencies and departments to review the script for the exhibit, ordered his museum staff to make additionals changes, and rearranged the sequence of the exhibit panels so that the discussion of climate change was not immediately encountered by museum visitors. Shortly before the exhibit opened in April 2006, officials at NOAA and the United States Department of Commerce expressed to their superiors their opinion that the exhibit had been changed to accommodate political concerns. In an interview with The Washington Post in November 2007, Samper said he felt the exhibit displayed a scientific certainty that did not exist, and expressed his belief that the museum should present evidence on both sides and let the public make up its own mind.
The controversy became more heated after the press reported that Samper gave permission for the museum to accept a $5 million donation from American Petroleum Institute that would support the museum's soon-to-be-opened Hall of Oceans. Two members of the Smithsonian Institution's Board of Regents (which had final say on accepting the donation) questioned whether the donation was a conflict of interest . Before the board could consider the donation, the donor withdrew the offer.
Risser resigned as acting director of the museum on January 22, 2008, in order to return to his position at the University of Oklahoma. No new acting director was named at that time. Six weeks later, the Smithsonian regents chose Georgia Tech president G. Wayne Clough as the new Secretary. Samper stepped down to return to his position as Director of the National Museum of Natural History.
The remainder of Samper's tenure at the museum proved less controversial. In June 2008, the Victoria and Roger Sant family donated $15 million to endow the new Ocean Hall at the museum. The museum celebrated the 50th anniversary of its acquisition of the Hope Diamond in August 2009 by giving the gemstone its own exhibit and a new setting. In March 2010, the museum opened its $21 million human evolution hall.
In January 2012, Samper said he was stepping down from the National Museum of Natural History to become president and chief executive officer of the Wildlife Conservation Society . Two months later, the museum announced it had received a $35 million gift to renovate its dinosaur hall, and a month later the Sant family donated another $10 million to endow the director's position. On July 25, 2012 Kirk Johnson , vice president of research and collections at the Denver Museum of Nature and Science , was named Samper's successor effective October 29, 2012. Johnson oversees a museum with 460 employees and a $68 million budget. 
Research and collections
The Smithsonian gives an approximate number for artifacts and specimens of 127.3 million.  More specifically, the collections include 30 million insects, 4.5 million plants preserved in the Museum’s herbarium, and 7 million fish stored in liquid-filled jars.  Of the 2 million cultural artifacts, 400,000 are photographs housed in the National Anthropological Archives .  Through an off-site active loan and exchange program, the museum's collections can be accessed.  As a result, 3.5 million specimens are out on loan every year.  The rest of the collections not on display are stored in the non-public research areas of the museum and at the Museum Support Center , located in Suitland, MD.  Other facilities include a marine science center in Ft. Pierce, Florida and field stations in Belize, Alaska, and Kenya. 
Hall of Geology, Gems, and Minerals
The National Gem and Mineral Collection is one of the most significant collections of its kind in the world. The collection includes some of the most famous pieces of gems and minerals including the Hope Diamond and the Star of Asia Sapphire , one of the largest sapphires in the world. There are currently over 15,000 individual gems in the collection, as well as 350,000 minerals and 300,000 samples of rock and ore specimens.  Additionally, the Smithsonian's National Gem and Mineral Collection houses approximately 35,000 meteorites , which is considered to be one of the most comprehensive collections of its kind in the world. 
The collection is displayed in the Janet Annenberg Hooker Hall of Geology, Gems and Minerals, one of the many galleries in the Museum of Natural History. Some of the most important donors, besides Hooker, are Washington A. Roebling , the man who built the Brooklyn Bridge , who gave 16,000 specimens to the collection; Frederick A. Canfield , who donated 9,000 specimens to the collection; and Dr. Isaac Lea , who donated the basis of the museum’s collection of 1312 gems and minerals.
Hall of Human Origins
The David H. Koch Hall of Human Origins opened on March 17, 2010, marking the museum's 100th anniversary. The hall is named for David H. Koch , who contributed $15 million to the $20.7 million exhibit.  
The Hall is "dedicated to the discovery and understanding of human origins," and occupies 15,000 square feet (1,400 m 2 ) of exhibit space. Specimens include 75 replica skulls, an interactive human family tree that follows six million years of evolution,  and a Changing the World gallery that focuses on issues surrounding climate change and humans' impact on the world. The Hall's core concept idea is "What Does It Mean To Be Human", and focuses on milestones of Human Evolution such as Walking Upright , Bigger Brains, and Creating a World of Symbols. Also covered is the Smithsonian's significant research on the geological and climate changes which occurred in East Africa during significant periods of Human Evolution. The exhibit highlights an actual fossil Neanderthal and replicas created by famed paleoartist, John Gurche .  The exhibit has been criticized for downplaying the significance of human-caused global warming .  
The exhibit also provides a complementary web site, which provides diaries and podcasts directly from related fields of research. The Companion Book, What Does It Mean To Be Human was written by Richard (Rick) Potts , the Curator, and Christopher Sloan. The exhibit was designed by Reich + Petch. 
Dinosaurs/Hall of Paleobiology
The museum has over 570,000 catalogued reptiles from around the world. The National Collection of Amphibians and Reptiles has increased 300 percent since 1970 to over 570,000 specimen records in 2008.  The Hall of Dinosaurs has fossilized skeletons and cast models, including Tyrannosaurus rex cast facing a Triceratops cast. The Triceratops exhibit shows the first accurate dinosaur skeleton in virtual motion, achieved through the use of scanning and digital technology."   The collection consists of 46 "complete and important specimens" of dinosaurs. 
In May 2012, billionaire David H. Koch donated $35 million toward the cost of a $45 million upgrade to the 30-year-old, 25,000 square feet (2,300 m 2 ) dinosaur hall. The hall is anticipated to close in the spring of 2014 and reopen in 2019. 
In June 2013, the Smithsonian obtained a 50-year lease on a T. rex fossil skeleton owned by the United States Army Corps of Engineers . It is the first T. rex skeleton to be displayed at the museum, which until now has only had the cast of a skull. The specimen, known as the "Wankel" or "Devil" rex , was found on Corps-owned land in the Charles M. Russell National Wildlife Refuge in Montana in 1988. It has since been on display at the Museum of the Rockies in Bozeman, Montana (which helped excavate the fossil).  The "Wankel rex" (whose skeleton is 85 percent complete)  was to be unveiled at the Museum of Natural History on National Fossil Day, October 16, 2013, and was supposed to be on display until the dinosaur hall exhibit closes for renovation in the spring of 2014. The 35-foot (11 m) long skeleton will be the centerpiece of the dinosaur hall when it re-opens in 2019.  The Museum of the Rockies (which did not own the skeleton but was the repository for it) has about a dozen T. rex specimens, including one which is eighty percent complete. Only about six museums in the United States have a T. rex skeleton. The Museum of the Rockies is a Smithsonian affiliate museum, and had long promised to find a T. rex for the Smithsonian to display. 
Due to the 2013 federal government shutdown , the fossil did not arrive in Washington, D.C. Smithsonian officials said it remained in storage in Montana, and would not arrive at the Smithsonian until late spring 2014. Packed up in 16 crates, the T. rex, named “Nation’s T. rex” by the Smithsonian, traveled from the Museum of the Rockies and arrived at the National Museum of Natural History on April 15, 2014.  The T. rex has been displayed in the Rex Room, while specialists performed a conservation assessment and the Smithsonian Digitization Program scanned each bone, to create a 3-D model for research.  The Nation’s T. rex will be the centerpiece of the new fossil hall, opening in 2019. 
Hall of Mammals
The Behring Hall of Mammals designed by Reich + Petch is a multi-award-winning gallery. The mammal specimens are presented as works of modern art within strikingly minimal environmentals. Visitors discover mammal's evolutionary adaptions to hugely diverse contexts, and ultimately discover that they too are mammals.
The museum has the largest collection of vertebrate specimens in the world, nearly twice the size of the next largest mammal collections, including historically important collections from the nineteenth and early twentieth centuries. Its collection was initiated by C. Hart Merriam and the U.S. Department of Agriculture (later the Department of the Interior ), which expanded it in the 1890s-1930s. 
The O. Orkin Insect Zoo features live insects and exhibits about insects and entomologists . Different habitats have been created to show the type of insects that live in different environments and how they have adapted to a freshwater pond , house, mangrove swamp , desert , and rain forest . The zoo is sponsored by Orkin , a pest control company.
The Sant Ocean Hall opened on September 27, 2008, and is the largest renovation of the museum since it opened in 1910. The hall includes 674 marine specimens and models drawn from the over 80 million specimens in the museum's total collection, the largest in the world. The hall is named for the Roger Sant family, who donated $15 million to endow the new hall and other related programs.
The collection includes: a coelenterate-long North Atlantic Right Whale , a 1,500-gallon aquarium, one female giant squid displayed in the center of the hall and a male displayed off to the side, an adult coelenterate , and a Basilosaurus . 
The museum also provides the Smithsonian Ocean Portal , a complementary web site which provides regularly updated, original content from the museum’s research, collections, and Sant Ocean Hall as well as content provided by more than 20 collaborating organizations, including Archive, Census of Marine Life, Consortium for Ocean Leadership, Encyclopedia of Life, INDUCT, Monterrey Bay Aquarium, Monterrey Bay Aquarium Research Institute, National Geographic, NOAA, New England Aquarium, Ocean Conservancy, Oceania, Pew Charitable Trusts, Sea Web, Save Our Seas, Scrips Institution of Oceanography, Woods Hole Oceanographic Institution, World Heritage Marine Programmer.
This exhibit and associated website "examines the diversity, dynamism, and global influence of Africa 's peoples and cultures over time in the realms of family, work, community, and the natural environment." 
Butterflies + Plants: Partners In Evolution
Featuring a live butterfly pavilion allows "visitors to observe the many ways in which butterflies and other animals have evolved, adapted, and diversified together with their plant partners over tens of millions of years."  The exhibit was designed by Reich + Petch.
Western Cultures Hall
"This hall explores some examples from various cultures in the western world including northern Iraq , ancient Egypt , Greece and Rome and the recent discovery of the Iceman , a Copper Age mummy found in an Italian glacier ."  This exhibit closed September 26, 2010.
The Korea Gallery is a special showcase to celebrate Korean traditions and examine its unique influence and complex role in the world today.
The exhibit expresses the continuity of the past by highlighting enduring features of Korean culture that have influence and resonance today. The exhibit uses the Smithsonian ceramics collection as well as a rich selection of photographs, ritual objects and traditional Korean carpentry to communicate and connect to both the local Korean community and an international audience. Traditional art forms, such as ceramics and calligraphy, along with mythological figures, language, large feature photographs and illustrations speak to a range of shared historical memories that connect Koreans at home and abroad.
Personal stories of modern Koreans, as told in their own voices, provide a context to discuss some of the many issues that face the divided country today. Korea's incredible transformation from 'The Hermit Kingdom' to a world power is traced through its impact on the arts, the economy and popular culture. The exhibit was designed by Reich + Petch.
Teleology: Hall of Bones
Opened since 2013, this exhibit is the museum's interactive and educational area. Using, microscopes and touch screens, the area hosts various interactive activities and puzzles visitors can experience and contains a "collection zone" that houses over 6000 different specimens and artifacts visitors are able personally handle. The area also hosts various events such as allowing visitors to meet and discuss with Smithsonian scientists and hosting school groups. 
November 2, 2007 – November 16, 2011
Using artifacts, rare photographs, and ephemera to explore the origins and religious practices of the movement in Jamaica , this exhibition takes viewers beyond the popular Jamaican music known as reggae to the deeper roots of the Rastafari culture. Video footage featuring first-person testimony from male and female Rastafari of different ages, nationalities, and racial and class backgrounds speak to Rastafari of unity and to the spread of the movement across the Caribbean and beyond over the past three decades. 
Dig It! The Secrets of the Soil
Written in Bone: Forensic Files of the 17th-Century Chesapeake
February 7, 2009 – February 6, 2014
This exhibition and associated website examines history through 17th-century bone biographies, including those of colonists teetering on the edge of survival at Jamestown , Virginia, and those of wealthy and well-established individuals of St. Mary's City, Maryland. 
Farmers, Warriors, Builders: The Hidden Life of Ants
The Discovery Room, a family- and student-friendly hands-on activity room on the first floor. 
In the lower level, there is a bird exhibit, Urban Bird Habitat Garden, with all the migratory and native birds to Washington D.C. 
The Global Volcanism Program is housed in the department of Mineral Sciences.
The museum frequently hosts sleepovers through the Smithsonian Associates for children ages 8–12. 
In popular culture
- In Fallout 3 , a derelict exhibit at the museum serves as the entrance to Underworld, a civilization established by ghouls.
- In the 2008 film Get Smart , the fictional spy organization CONTROL is located underneath the National Museum of Natural History.
- The giant squid from the National Museum of Natural History inspired the octopus that comes to life in 20th Century Fox 's film Night at the Museum: Battle of the Smithsonian . 
- The exteriors of the Museum were used as a model for the "Leyendecker Museum" in the Sierra On-Line 1991 adventure game The Dagger of Amon Ra .