Federal Bureau of Investigation

Officially named the J Edgar Hoover FBI Building, after its notorious long-time director, the ugly concrete structure is headquarters of the Federal Bureau of Investigation. Public tours have been suspended indefinitely, but were once the most popular attraction in Washington, DC. Guided tours took visitors through the Material Analysis Unit and crime laboratories where fingerprinting, DNA and ballistics testing takes place; past displays of thousands of confiscated weapons, and illegal items seized during narcotics operations; exhibits on crime fighting techniques and counterintelligence operations; as well as other presentations on terrorism, agent training, some famous cases, and photographs of the FBI's 'Ten Most Wanted List'. Those in search of espionage history, however, should go to the nearby International Spy Museum.

Address: 935 Pennsylvania Avenue

Website: www.fbi.gov

Telephone: (202) 324 3447

Transport: Federal Triangle metro station