The crumbling remains of a 19th century fortess.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The birthplace of both the Atomic Age and Godzilla, and the namesake of the bathing suit.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

The final resting place of the world's first nuclear reactor.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

A mysterious find dredged from Louisiana waters.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This ancient Chinese observatory still contains early astronomy technology.

Once one of the largest producers of pig iron in the world.

Space program, pneumatics and more, bits and pieces, for movie sets or the common man.