Affiliated with but not a part of the Smithsonian, the National Gallery needs two buildings (connected by an underground tunnel) to house its stunning collections (more than 110,000 objects) of painting, sculpture, and decorative arts from the Middle Ages to the present. Kids love the walking escalator that traverses the two buildings and conveniently empties into the airy cafeteria.
The original neoclassical building, known as the West Building, exhibits primarily European works, from the Middle Ages to the early 20th century, including pieces by El Greco, Monet, and Cézanne.
Across 4th Street NW, the angular East Building is where you'll find the Calder mobile along with other abstract and modern works. Across 7th Street from the West Wing sits the National Gallery Sculpture Garden, a beautifully landscaped park of open lawns, a pool with a spouting fountain, and 17 sculptures.