A Reformation-era fiery figurehead once denoted this location as a print shop.

This is the oldest Roman-made bridge in the city still existing in its original state.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

These precariously placed ruins harken back to a 13th-century castle.

This eatery transports diners to a place that no longer exists: East Germany.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

The last water-powered mill in Oregon is open daily for free tours and has a surprising history.

Ride a boat through this magnificent underground world, which now doubles as a theater.

A grove of "candelabra redwoods" deep in California's Lost Coast.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.

Home of a French nobleman's short-lived attempt at raising cattle in the Badlands of North Dakota.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

The real-life site of Ichabod Crane's infamous gourd attack.

One of the few places where you can visit a cenote and Maya ruins at the same time.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

A new kind of theme park for adults off the Las Vegas Strip.

The site of one of Japan's very few American occupations during World War II still holds the relics of a roundly disastrous campaign.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.