State Department
http://www.state.gov/www/about_state/diprooms/index.html
The Department of State is located at 2201 C Street NW and offers free tours of the foreign diplomatic rooms. Tours are offered at 9:30am, 10:30am, and 2:45pm Monday through Friday. The tours last approximately 45 minutes. Please contact my office to submit a tour request.
Metro stop: Foggy Bottom