The International Spy Museum opened its doors in July 2002 in Washington, D.C. It boasts the largest public collection of espionage objects in the world, and it's also the first time that many of the items are viewed by the public. Check out the selected artifacts from the collection on the site, like a 1944 German enigma cipher machine from World War I, or a "Lipstick Pistol" used in the Cold War. Try solving fun puzzles in the Games section to test your spy skills.
If you're looking for more online spy activities, check out National Geographic Kids GeoSpy, which asks you to locate different countries and states around the world. Scholastic.com also has interactive I-Spy games to challenge your attention to detail and how quickly you can spot certain objects. The PBS Web site has a History Detective Kids section based on the channel's television program. The site includes cool games, a detective kit and a special feature called The Vault, where you can send in a photo of a mysterious item for fellow online visitors to check out. Learn more about the Central Intelligence Agency (CIA) on its Kids website by checking out its Hall of Famers, playing games and seeing related links.