The International Spy Museum is a privately owned museum dedicated to the field of espionage located within the 1875 Le Droit Building in the Penn Quarter neighborhood of Washington, D.C., across the street from the Old Patent Office Building (which houses the Smithsonian American Art Museum and the National Portrait Gallery) and one block south of the Gallery Place-Chinatown Metro station. The museum was built by Milton Maltz & the House on F Street, L.L.C. at a cost of approximately $40 million. It is one of the few museums in Washington that charges admission fees.