This Gothic-style cathedral is the sixth largest in the world and is put to all sorts of national purposes, such as President Wilsons funeral and a prayer vigil for American hostages during the Iranian crisis.

A memorial and museum detailing the rise of Hitler's Germany and the horrors of World War II.

Established in 1927 by an Act of the United States Congress, this national treasure contains 446 acres of fabulous flora and fauna and is especially known for its Asian, azalea and conifer collections.

This memorial to Korean War veterans consists of the Pool of Remembrance and the triangular Field of Service depicting 19 soldiers on the field of combat.

One of the world's greatest art museums is comprised of two buildings: one holds paintings from the 13th through the 18th centuries and the other exhibits modern art.

Former home of Post cereal heir Marjorie Merriweather Post houses the largest collection of Russian imperial art outside of Russia.

The most popular of the Smithsonian museums features the Wright Brothers' 1903 Flyer and Lindbergh's Spirit of St. Louis.

A truly green spectacle, with a jungle, a National Garden with a First Ladies water garden, a rose garden and exhibits on ecology and evolutionary biology.

Established in 1910 and located on the National Mall, this prestigious museum, part of the Smithsonian Institution, holds the world's most extensive collection of natural history specimens and human artifacts including the remains of dinosaurs and tools used by early man.

Home to the Washington Opera, the National Symphony Orchestra, the Washington Ballet and more.

"Americas First Museum of American Art" boasts a collection of over 2,500 19th and 20th-century masters, both American and European, including Renoir, Picasso, Gauguin, Manet, OKeefe and more.

Created by Congress in 1980 to celebrate achievements in architecture, city planning, engineering and design.

Website: http://www.suprem...  Visiting hours: 9:00 a.m. to 4:30 p.m. Monday through Friday. Closed Saturdays, Sundays, and federal holidays. Lectures in the Courtroom are given every hour on the...

National Park Service Website: http://www.nps.go... Contains opening hours

The only presidential museum in D.C., the well-preserved former house of Woodrow Wilson.

The world's largest museum and research complex is actually comprised of 15 specialty museums, and other affiliates, with subjects that vary from African Art to the postal service, sculpture to space exploration.

D.C.'s largest private art museum has impressive collections of both American and European art.