"Smithsonian Modern Art Located on the National Mall, the Smithsonian Institution's only modern art museum boasts the United States' most comprehensive collection of 20th-century art, with more than 12,000 paintings, sculptures, and photographs. The spectrum and evolution of contemporary art are reflected in works from a diverse array of artists, including Matisse, Picasso, de Koonig, and Warhol. Adjacent to the museum, the 1.5-acre multi-terraced Sculpture Garden creates a tranquil area for viewing more than 60 sculptures, such as Rodin's "Burghers of Calais," which was nearly confiscated by the Nazis during World War II."