Since its founding in 1935, the Wilderness Society has helped to protect 110 million acres of wild lands throughout the United States. It is no wonder then that a lover of wilderness like Ansel Adams would decide to leave 75 of his most beautiful landscape photographs to this crusading institution. The famous photographer's work can be seen in this permanent collection, along with several other pieces of his work that have been gifted to the gallery since Adams' death in 1984. The collection is housed in a stunning refurbished gallery that won the Merit Award for Interior Architecture from the American Institute of Architects in 2010.

The many perspectives of the earth are examined here, including geology, oceanography, astronomy and anthropology. Enjoy creative and educational exhibits including a huge globe, a tornado simulator and a 'time machine'. Changing, lively special exhibits are also featured. A gift shop sells the National Geographic Society's videos, books and educational games.

Famous and distinguished Americans are honored at the National Portrait Gallery in portraits, photographs and other visual media. A wide variety of politicians, artists, scientists and social activists are represented. This gallery is a remarkable testimony to the diverse figures the United States has produced, from Grace Kelly and Boris Karloff to George Washington, Mickey Mantle and Gertrude Stein. Photographs, prints, drawings and sculptures supplement the paintings. Of particular interest is the Hall of Presidents, which features a portrait or sculpture of each chief executive.

The National Gallery houses an extensive collection of European and American art in two spectacular buildings. In the grand, neoclassical West Building, Rembrandt, Rubens and Gainsborough are well-represented. The permanent collection includes works from the 13th to 20th Centuries, including a section devoted to Impressionism. An underground concourse with a cafeteria, an excellent gift shop and a walled-in waterfall takes you to the East Building. Designed by I.M. Pei, this triangular building is a key city landmark and home to famous pieces of art and other temporary exhibitions.