The United States Botanic Garden (USBG) is a botanic garden run by the Congress of the United States. It is located in Washington, D.C., on the U.S. Capitol Grounds campus near Garfield Circle. The building itself, which includes a large Lord & Burnham greenhouse, is divided into separate rooms, each one simulating a different habitat.

Admission to all public areas of the U.S. Botanic Garden is FREE.

Conservatory Hours: open 10 AM - 5 PM daily, including all weekends & holidays
National Garden Hours: open 10 AM - 5 PM daily, including all weekends & holidays
Bartholdi Park Hours: open dawn to dusk, daily, including all weekends & holidays

U.S. Botanic Garden
100 Maryland Avenue, SW
Washington, DC 20001
202-225-8333

http://www.usbg.gov/index.cfm