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Smithsonian Institution

The Smithsonian Institution is a group of museums in the United States. Its first building looks like a red castle. The Smithsonian was started with money left by a scientist from England.

The Smithsonian Institution was set up by an act of Congress in 1846, using money that the English scientist James Smithson left to the United States 'for the increase and diffusion of knowledge'. Its first building, a red sandstone 'Castle' with many towers on the National Mall in Washington, D.C., was finished in 1855.

The Smithsonian Institution was established by the act of Congress signed on August 10, 1846, to carry out James Smithson's bequest of about $500,000 'for the increase and diffusion of knowledge among men'. Its original home, the Smithsonian Institution Building or 'Castle', was designed by James Renwick Jr. and built in 1847–1855 of Seneca sandstone from Maryland; it was declared a National Historic Landmark in 1965.

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Photo: Highsmith, Carol M., 1946-, photographer, public domain, via Wikimedia Commons

Discover the Smithsonian

The Smithsonian is in Washington, D.C., in the United States.

Its first building is made of red stone. It has lots of towers, like a castle. People call it the Castle.

The Smithsonian Institution began with a gift. James Smithson, a scientist from England, left his fortune to the United States to found an establishment in Washington 'for the increase and diffusion of knowledge among men'. In 1846 Congress set up the Smithsonian to carry out his wish.

Its first building stands on the south side of the National Mall in Washington. Architectural Record says it is known as 'the Castle' thanks to its tall turrets, square towers and red sandstone front. Histories of the National Mall, from George Mason University, says it opened in 1855 as the first museum on the Mall.

The preamble to the Smithsonian's founding laws, quoted in the notes to the United States Code, records that 'James Smithson, esquire, of London' left the whole of his property to the United States to found at Washington 'an establishment for the increase and diffusion of knowledge among men', and that Congress accepted the trust. Today's law still names the President, the Vice President, the Chief Justice and the heads of executive departments as the 'establishment' called the Smithsonian Institution.

The Smithsonian Institution Building stands on the south side of the Mall at Tenth Street. Its 1971 National Historic Landmark nomination calls it the finest remaining example of Norman Revival civil architecture in the country; other writers call its style Gothic Revival. Histories of the National Mall describes it as the first museum on the Mall.

Where
the National Mall, Washington, D.C., United States
Founded
act of Congress signed August 10, 1846
First building
the 'Castle', built 1847–1855
Architect
James Renwick Jr.
View Smithsonian Castle Aerial, Washington, D.C
Photo: Highsmith, Carol M., 1946-, photographer, public domain, via Wikimedia Commons

A gift, an act of Congress and a building

A scientist named James Smithson left his money to the United States.

The money was used to start the Smithsonian. Its castle building was finished more than 170 years ago.

The act that set up the Smithsonian was signed by President James K. Polk on August 10, 1846. Smithson's gift was worth about $500,000. The Smithsonian's leaders, the Board of Regents, invited architects to send designs, and James Renwick Jr., an architect from New York City, was chosen.

The cornerstone was laid on May 1, 1847, after a great procession in which President Polk marched. The building was finished in 1855. The first Secretary, Joseph Henry, moved into rooms in the East Wing with his family in 1849, while work went on.

According to the 1971 National Historic Landmark nomination, the act establishing the Smithsonian was signed by President James K. Polk on August 10, 1846, after James Smithson, an English scientist, left a bequest of about $500,000. The charter told the Board of Regents to choose a site on the Mall or on public ground near the Patent Office and to erect 'a suitable building, of plain and durable materials and structure, without unnecessary ornament'. A building committee toured American cities and invited designs; the New York architect James Renwick Jr., later the designer of St. Patrick's Cathedral, was chosen, with Robert Mills as assistant architect.

The cornerstone was laid on May 1, 1847. The East Wing was ready by April 1849, when the first Secretary, Joseph Henry, moved in with his family; Henry criticized the elaborate style as a waste of space and money. Renwick withdrew in 1852, and the building was completed in 1855 at a cost of $318,727, far above the estimate.

Through the years

Built of Seneca sandstone

The builders looked at many kinds of stone.

They chose a stone that was easy to cut and cheaper than marble. It came from Seneca Creek in Maryland.

The building committee first wanted white marble, the nomination says, and looked at quarries in 25 places. In the end they chose sandstone from Seneca Creek on the Potomac River in Maryland, about 23 miles from Washington, for its color, how well it stands up to weather and its low cost. Marble then cost 70 cents a cubic foot; the sandstone cost only 20 cents.

The sandstone was soft enough to cut easily, but it hardened after a few months in the air. In 1850 part of the poorly built wooden center fell into the basement, so the center was rebuilt to resist fire.

The nomination records that the committee first decided on white marble, examined marble, granite and sandstone quarries at 25 sites, and settled on stone from Seneca Creek on the Potomac, 23 miles from Washington, for 'its beauty of color, durability to the weather and cheapness to procure'. Marble and granite were hard and costly to cut; the Seneca stone, though soft, hardened rapidly after several months of exposure. Marble then cost 70 cents per cubic foot, sandstone 20 cents. (The nomination calls it brown sandstone in one passage and red Seneca sandstone in another; Architectural Record gives red sandstone from Maryland's Seneca Quarry.)

On February 26, 1850, a large section of the poorly built interior of the central section fell into the basement. The committee had all its woodwork removed and the center made fireproof, at an extra cost of $44,000. The exterior was completed during 1851.

Towers, halls and a fire

The Castle has eight towers. No two of them are the same!

Inside, a great hall was made for museum displays. Upstairs there was a lecture room for 2,000 people.

The building's eight towers are its most interesting outside feature, the nomination says, and each is different in height and design. The south tower is 91 feet high, and a double bell tower, or campanile, reaches 117 feet.

When it opened, the building held a museum hall, a library, laboratories, an art gallery and a lecture room for 2,000 people. In January 1865 a fire destroyed the main towers, the roof and the second floor of the central section. The Washington architect Adolph Cluss led the rebuilding.

The building of 1847–1855 had five main parts, a central section, two wings and two connecting ranges, with four principal towers and five minor ones; the 1971 nomination later counts eight towers, all different, among them the south tower (37 ft square including buttresses, 91 ft high) and a double campanile at the northeast corner (117 ft to its finial). The central section's upper story held a lecture room for 2,000 people; the first story was a great museum hall, empty in 1855 for lack of cases, which Joseph Henry called 'in appearance one of the most imposing rooms in this country'.

On the night of January 24, 1865, fire destroyed the principal south tower, the two principal north towers, the second floor and the roof of the central section. Adolph Cluss directed the renovation from 1865, lining the cracked towers with brick and rebuilding the south tower in six stories. The nomination also describes a former vestibule turned into a Children's Museum, with birds in glass cases and aquariums 'chosen to excite the wonder of children'.

Towers
eight, all different in height and design
South tower
37 feet square and 91 feet high
Double campanile
117 feet to the top of its finial
Lecture room (1855)
could hold 2,000 people
View Smithsonian Castle Aerial, Washington, D.C
Photo: Highsmith, Carol M., 1946-, photographer, public domain, via Wikimedia Commons

The Castle from the air

In the photo, the red Castle has gray roofs and many towers.

In front of it is a garden with neat green squares. Two pavilions with pale roofs stand at the bottom.

This photo was taken from the air in September 2006 by Carol M. Highsmith. The red Castle stretches across the middle, with gray roofs and towers of many shapes; a tall tower at the back has a flag on top. In front lies a formal garden with paths and patterned lawns, the Enid A. Haupt Garden, and at its far end stand two pavilions, one with pointed roofs and one with domes. Behind the Castle are the lawns of the National Mall.

In January 2023 the Smithsonian announced that the Castle would close for a renovation of about five years, expected to finish in 2028, and that its garden would stay open.

Carol M. Highsmith's aerial photograph (20 September 2006, Library of Congress collection) looks across the Castle from its garden side: the long red building with slate-gray roofs, the massive south tower facing the garden, and behind it the taller north towers, one flying a flag, with the Mall's lawns beyond. The formal Enid A. Haupt Garden fills the foreground; at its far end are two pavilions, one under pointed roofs and one under domes.

Architectural Record reported in January 2023 that the Castle, then home to the Smithsonian's administrative headquarters and main Visitor Center, would close on February 1 for a top-to-bottom renovation, its first since the late 1960s, expected to be finished in 2028, with its red sandstone façade unchanged. The four-acre garden and the paths to the Arthur M. Sackler Gallery and the National Museum of African Art were to stay open.

View Smithsonian Castle Aerial, Washington, D.C
Photo: Highsmith, Carol M., 1946-, photographer, public domain, via Wikimedia Commons

Amazing facts

  • The Smithsonian started with money from a scientist who lived in England.

    James Smithson of London left the whole of his property to the United States to found the Smithsonian.

    The preamble to the Smithsonian's founding statutes records that James Smithson left 'the whole of his property' to the United States to found 'an establishment for the increase and diffusion of knowledge among men'.

  • The first boss of the Smithsonian lived inside the Castle with his family.

    The first Secretary, Joseph Henry, moved into the East Wing with his family in 1849, before the building was even finished.

    The East Wing was ready by April 1849, allowing Secretary Joseph Henry to live on its second floor with his wife and family while the rest of the building went up.

  • Long ago, the Castle had a special room just for children.

    One room became a Children's Museum, with birds in glass cases and aquariums 'chosen to excite the wonder of children'.

    The nomination describes the old south vestibule of the Great Hall turned into a Children's Museum, with a mosaic floor, painted ceiling, birds in glass cases and aquariums 'chosen to excite the wonder of children'.

  • The builders picked a stone that was cheaper than marble.

    Seneca sandstone cost 20 cents a cubic foot, while marble cost 70 cents.

    The committee chose Seneca sandstone partly on price: 20 cents per cubic foot against 70 cents for marble, which was also harder and costlier to cut.

Words to know

bequest
money or property that a person leaves to someone in their will
act of Congress
a law passed by the United States Congress
sandstone
a rock made of grains of sand pressed and cemented together
campanile
a bell tower
cornerstone
a stone laid at a corner of a new building in a ceremony when building begins
regents
the members of a board that governs an institution

Discovery challenge

  1. Who gave the money to start the Smithsonian?

    Whose gift paid for the founding of the Smithsonian Institution?

    Whose bequest did Congress accept in 1846 to found the Smithsonian Institution?

    • James Smithson
    • James Renwick Jr.
    • Joseph Henry
    Show the answer

    James Smithson

    James Smithson, a scientist from England!

    James Smithson, an English scientist who left his property to the United States.

    James Smithson of London; his bequest was about $500,000.

  2. What is the Smithsonian's first building often called?

    What nickname does the Smithsonian Institution Building have?

    By what popular name is Renwick's Smithsonian Institution Building known?

    • The Castle
    • The Tower
    • The Palace
    Show the answer

    The Castle

    The Castle!

    The Castle, because of its towers and red stone.

    'The Castle'.

  3. Why did the builders pick Seneca sandstone?

    Why did the building committee choose Seneca sandstone instead of marble?

    Which reasons does the nomination give for choosing Seneca sandstone?

    • Its color, toughness in weather and low cost
    • It was the hardest stone
    • It glowed in the dark
    Show the answer

    Its color, toughness in weather and low cost

    It looked nice, lasted well and cost less!

    For its color, how well it stands up to weather and its low cost: 20 cents a cubic foot instead of 70.

    'Its beauty of color, durability to the weather and cheapness to procure'.

  4. How many towers does the Castle have?

    How many towers does the Smithsonian Castle have?

    How many towers, all different in height and design, does the 1971 nomination count?

    • Eight
    • Two
    • Twenty
    Show the answer

    Eight

    Eight towers!

    Eight, and no two are alike.

    Eight, the building's most interesting exterior feature.

  5. In which city is the Smithsonian Castle?

    In which city does the Smithsonian Castle stand?

    In which city does the Smithsonian Institution Building stand on the south side of the Mall?

    • Washington, D.C.
    • New York City
    • London
    Show the answer

    Washington, D.C.

    Washington, D.C.!

    Washington, D.C., on the National Mall.

    Washington, D.C., at Tenth Street on the Mall.

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For parents & teachers

What children will learn

  • Locate the Smithsonian Castle on the National Mall in Washington, D.C., and explain how a scientist's bequest led to the Smithsonian.
  • Describe how the builders chose their stone by weighing color, durability and cost.
  • Recognize that buildings are changed, damaged, repaired and renovated over their lives.

Recommended ages: 4 to 17 · About 15 minutes

Talk about it

  • James Smithson left his money 'for the increase and diffusion of knowledge'. What do you think that means?
  • The first Secretary thought the building's style wasted space and money. Should public buildings be plain or grand?
  • If you could leave a gift to help people learn, what would it be?

Try at home or in class

  • Compare a piece of chalk and a pebble: scratch each gently with a coin to see which is softer, and talk about why soft stone is easier to carve.
  • Draw your own 'castle for knowledge' with eight different towers, and label what each tower would be used for.

Key vocabulary: bequest, act of Congress, sandstone, campanile, cornerstone, regents

Where these facts come from

  1. Wikidata , Wikimedia Foundation (CC0 1.0)
  2. Smithsonian Institution Building, National Historic Landmark nomination (1971) , National Park Service
  3. Smithsonian Institution Building , Histories of the National Mall, Roy Rosenzweig Center for History and New Media, George Mason University
  4. 20 U.S. Code § 41: Incorporation of Institution , Legal Information Institute, Cornell Law School
  5. The Smithsonian Announces Renovation of its Historic 'Castle' , Architectural Record
  6. Wikimedia Commons , Wikimedia Foundation (Per file (public domain, CC0, CC BY or CC BY-SA); see each media record)

Checked, not yet human-reviewed. Last updated November 1, 2026. Spotted a mistake? Tell us.

Picture credits
  • Photo: Highsmith, Carol M., 1946-, photographer, public domain, via Wikimedia Commons · source