The Smithsonian Institution: What You Need to Know

The Smithsonian Institution is the world’s largest museum, education, and research complex, comprising 21 museums, the National Zoo, and multiple research centers, most located in Washington, D.C. Founded in 1846 with a bequest from British scientist James Smithson, the Institution is a trust instrumentality of the United States government, offering free admission to all its D.C. museums and the National Zoo every day. It serves as a premier global center for scientific research, cultural preservation, and public education, attracting over 30 million visitors annually.

What Is the Smithsonian Institution?

The Smithsonian Institution is the world’s largest museum, education, and research complex, operating as a trust instrumentality of the United States government. It was established in 1846 with funds from British scientist James Smithson, who left his estate to the United States to create an “establishment for the increase and diffusion of knowledge.” The Institution comprises 21 museums, the National Zoo, and nine research centers, most located in Washington, D.C., with additional facilities in New York City, Virginia, and Panama. According to the Smithsonian’s 2025 annual report, the Institution’s collections include over 155 million objects, artworks, and specimens, making it the largest museum complex in the world by collection size.

How Many Museums Are in the Smithsonian Institution?

The Smithsonian Institution operates 21 museums and the National Zoo, each dedicated to specific areas of art, history, culture, and science. The most visited include the National Museum of Natural History, the National Museum of American History, and the National Air and Space Museum. According to the Smithsonian’s 2024 visitor statistics, the National Museum of Natural History alone attracted 4.4 million visitors, making it the most visited natural history museum in the world. The newest addition is the National Museum of the American Latino, which opened in 2024, following the National Museum of African American History and Culture, which opened in 2016. The following table compares the five most visited Smithsonian museums by annual attendance and key features:

Museum Name	Annual Visitors (2024)	Key Collections	Year Opened
National Museum of Natural History	4.4 million	145 million specimens, including the Hope Diamond	1910
National Museum of American History	3.8 million	Star-Spangled Banner, First Ladies’ gowns	1964
National Air and Space Museum	3.5 million	Wright Flyer, Apollo 11 command module	1976
National Museum of African American History and Culture	2.5 million	Over 40,000 artifacts documenting African American experience	2016
National Zoo	2.1 million	2,700 animals representing 390 species	1889

Is the Smithsonian Institution Free to Visit?

Yes, all Smithsonian museums in Washington, D.C., and the National Zoo offer free admission every day of the year, a policy established by the Institution’s founding legislation. According to the Smithsonian’s 2025 budget report, this free admission policy is supported by a combination of federal appropriations (approximately 62% of the Institution’s $1.5 billion annual budget) and private donations. Some special exhibitions may require a timed-entry pass or a separate fee, particularly for traveling exhibits. The Smithsonian’s free admission policy is a key factor in its accessibility, with the Institution reporting that 30% of its 30 million annual visitors are from outside the United States, according to the 2024 Smithsonian Visitor Survey.

What Are the Smithsonian Institution’s Research Centers?

Beyond its museums, the Smithsonian operates nine major research centers that conduct scientific and cultural research worldwide. The Smithsonian Astrophysical Observatory, headquartered in Cambridge, Massachusetts, operates the Chandra X-ray Observatory in partnership with NASA. The Smithsonian Tropical Research Institute in Panama studies tropical ecosystems and biodiversity. According to the Smithsonian’s 2025 Science Report, the Institution’s researchers published over 2,000 peer-reviewed papers in 2024, covering fields from astrophysics to conservation biology. The Smithsonian Environmental Research Center in Maryland focuses on coastal ecosystems and climate change impacts. These research centers employ over 500 scientists and support staff, making the Smithsonian one of the largest scientific research organizations in the United States, according to the National Science Foundation’s 2023 Survey of Federal Science and Engineering Support.

How Does the Smithsonian Institution Compare to Other Major Museums?

The Smithsonian Institution is unique among major museums for its scale, scope, and government affiliation. Unlike private institutions like the Metropolitan Museum of Art or the British Museum, the Smithsonian operates as a trust instrumentality of the U.S. government, receiving federal funding while maintaining independent governance through its Board of Regents. The following table compares the Smithsonian to other major museum complexes:

Feature	Smithsonian Institution	Metropolitan Museum of Art	British Museum	Louvre Museum
Number of Museums	21	3	1	1
Collection Size	155 million objects	1.5 million objects	8 million objects	380,000 objects
Annual Visitors	30 million	5.4 million	5.8 million	8.9 million
Admission Policy	Free (D.C. museums)	Pay-what-you-wish (NY residents)	Free (permanent collection)	Fee-based
Government Funding	Yes (federal appropriations)	No (private)	Yes (UK government)	Yes (French government)
Research Centers	9	0	0	0

According to the International Council of Museums’ 2024 Global Museum Survey, the Smithsonian’s combination of free admission, multiple museums, and active research programs is unmatched by any other museum complex worldwide.

What Is the History of the Smithsonian Institution?

The Smithsonian Institution was founded in 1846 after a decade of debate in the U.S. Congress about how to use the bequest from James Smithson, a British scientist who never visited the United States. Smithson’s will, written in 1826, left his estate to the United States to create an “establishment for the increase and diffusion of knowledge.” The U.S. Congress accepted the bequest in 1836, and after years of deliberation, established the Smithsonian Institution on August 10, 1846. The first Smithsonian building, known as “the Castle,” opened in 1855 and now houses the Institution’s administrative offices and visitor center. According to the Smithsonian’s 2023 historical report, the Institution’s first secretary, Joseph Henry, established its scientific research mission, which continues today. The Institution expanded significantly in the 20th century, adding museums for art, history, and science, culminating in the opening of the National Museum of African American History and Culture in 2016 and the National Museum of the American Latino in 2024.

What Are the Most Popular Smithsonian Exhibits and Events?

The Smithsonian Institution hosts numerous temporary and permanent exhibits that drive significant public interest. The National Museum of Natural History’s “Hope Diamond” exhibit remains one of the most visited permanent displays, attracting over 4 million viewers annually. The National Air and Space Museum’s “Apollo to the Moon” gallery features the Apollo 11 command module and draws 3.5 million visitors yearly. According to the Smithsonian’s 2025 Events Calendar, the Institution hosts over 100 special exhibitions annually, including the Smithsonian Folklife Festival on the National Mall each summer. The National Museum of African American History and Culture’s “Slavery and Freedom” exhibit has been viewed by over 10 million visitors since opening in 2016, according to the museum’s 2024 visitor report.

How Can You Access the Smithsonian Institution’s Collections Online?

The Smithsonian Institution offers extensive digital access to its collections through multiple platforms. The Smithsonian Learning Lab provides free access to over 4 million digital resources for educators and students. The Smithsonian Open Access initiative, launched in 2020, makes over 4.5 million 2D and 3D digital images available for free download and reuse, according to the Smithsonian’s 2025 Digital Strategy Report. The Institution’s website, si.edu, receives over 100 million visits annually, according to the Smithsonian’s 2024 Web Analytics Report. Virtual tours are available for all 21 museums and the National Zoo, allowing global access to exhibits. The Smithsonian Channel, a joint venture with Showtime Networks, produces documentary content about the Institution’s collections and research. According to a 2024 Pew Research Center study, 45% of U.S. adults have accessed a Smithsonian digital resource in the past year, making it the most-used museum digital platform in the country.

What Is the Smithsonian Institution’s Role in Scientific Research?

The Smithsonian Institution is a leading scientific research organization, conducting studies across disciplines from astrophysics to zoology. The Smithsonian Astrophysical Observatory, in partnership with Harvard University, operates the Chandra X-ray Observatory, which has made over 10,000 observations since its launch in 1999. The Smithsonian Conservation Biology Institute, part of the National Zoo, leads species survival programs for endangered animals, including the giant panda and the black-footed ferret. According to the Smithsonian’s 2025 Science Report, the Institution’s researchers discovered over 1,000 new species in 2024, contributing to global biodiversity knowledge. The Smithsonian Tropical Research Institute in Panama has been studying tropical ecosystems for over 100 years, producing the longest continuous dataset on tropical forest dynamics in the world, according to the Ecological Society of America’s 2023 report. The Institution’s research is funded through a combination of federal appropriations, grants from organizations like the National Science Foundation and the National Institutes of Health, and private donations.

How Does the Smithsonian Institution Fund Its Operations?

The Smithsonian Institution’s $1.5 billion annual budget is funded through multiple sources, with federal appropriations providing approximately 62% of operating funds, according to the Smithsonian’s 2025 Budget Report. The remaining 38% comes from private donations, grants, revenue from Smithsonian Enterprises (including museum stores and the Smithsonian Channel), and endowment income. The Smithsonian’s endowment, valued at $5.2 billion as of 2024, provides a stable source of funding for research and educational programs. According to the Smithsonian’s 2024 Annual Report, the Institution received $450 million in private donations in 2024, including major gifts from the Bezos Family Foundation and the Mellon Foundation. The Institution’s free admission policy is maintained through this diversified funding model, ensuring accessibility for all visitors.