Washington, DC is known for monuments, memorials, and marble—but just south of the National Mall, one museum trades stone columns for secrets, gadgets, and global intrigue. Welcome to the International Spy Museum , where nothing is quite what it seems. Whether you’re a history buff, a pop-culture fan, or traveling with kids who need something interactive (read: fun), the International Spy Museum offers a one-of-a-kind look into the shadowy world of espionage—past and present.