The Smithsonian Institution Building, known as the Castle, stands at 1000 Jefferson Drive SW on the south side of the National Mall in Washington, D.C. It was designed by the architect James Renwick Jr. in a Norman, or Romanesque Revival, style and built of red Seneca sandstone from a quarry in Maryland between 1847 and 1855. The Smithsonian Institution was established by an act of Congress in 1846 after the British scientist James Smithson left his estate to the United States to found an institution for the increase and diffusion of knowledge. Smithson, who never visited the United States, died in 1829, and his remains were brought to the Castle in 1904 and now rest in a crypt in the building's north entrance. The Castle originally contained a museum, laboratories, a library, a lecture hall and living quarters for the first Secretary, Joseph Henry. A fire in 1865 destroyed the upper floors and the Smithsonian's early collections, and the building was rebuilt in the following years. Today the Castle serves as the Smithsonian's information center and administrative headquarters. The Great Hall, restored in 1987 to its Victorian character, offers a model of the National Mall and an introduction to the Smithsonian's museums, with an orientation film and touchscreen maps. A crypt room displays Smithson's tomb and a few of his personal items, including a replica of his portrait, and the building's interior includes the Commons gallery and a historic Renwick-designed hall. The surrounding Enid A. Haupt Garden, on the south side, is a Victorian-style garden above the Smithsonian's underground museums. The Castle's collection is interpretive, thematic and orientation-focused rather than an object-heavy museum, so a visit lasts between 30 minutes and an hour. Preservation has included major renovations in the 20th and early 21st centuries, with the building in continuous use and listed on the National Register of Historic Places. Admission is free.
| Admission | Free |
|---|---|
| Hours | Typically daily 8:30am-5:30pm; confirm at si.edu; +1-202-633-1000 |
| Address | 1000 Jefferson Dr SW, Washington, DC 20560 |
Why it matters
The Smithsonian Institution Building, known as the Castle, was the first Smithsonian building, completed in 1855, and houses the institution's founding mission, funded by the bequest of James Smithson for the increase and diffusion of knowledge. It anchors the world's largest museum and research complex.
Location
1000 Jefferson Dr SW, Washington, DC 20560
38.8888, -77.0260 View on map
Highlights
- James Renwick Jr.'s red sandstone Norman-style building of 1847-1855
- Crypt room holding the tomb of founder James Smithson
- The Great Hall's introduction to the Smithsonian's museums and a model of the Mall
- Adjacent Enid A. Haupt Garden
- Information center for planning a visit to the Smithsonian museums
Tips for visiting
- Start here to pick up maps and plan a route through the Smithsonian museums on the Mall; admission is free.
- Look for Smithson's crypt just inside the north entrance.
- Walk through the Enid A. Haupt Garden behind the Castle for views of the building.
- Visit first thing in the morning before the larger museums fill up.
- Allow 30 to 60 minutes for the interior and garden.
When to visit
Mornings are quietest. Spring and early summer are the busiest seasons, while the garden is at its best in spring.
Accessibility
The Castle has accessible entrances and elevators, and the Great Hall is on the main level. Ask at the information desk about accessible routes to the garden.
Frequently asked questions
Is the Smithsonian Castle free to enter?
Yes. Admission is free and no timed ticket is normally required.
How long does a visit take?
A typical visit lasts 30 to 60 minutes, longer if combined with the Haupt Garden.
Is it suitable for children?
Yes. The building is visually striking and short to tour, and the information center helps families plan the museums that follow.
Is the Castle English-language friendly?
Yes. Exhibits and signage are in English, and the information desk can provide maps and brochures in several other languages.