A 2017 crowdfunding campaign saved this historic castle from being destroyed.

This museum preserves over-the-top masterpieces that once qualified artisans for membership into a medieval guild.

This 12th century, partially destroyed, abbey has had several owners and was seized during the French Revolution.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Explore an eerie, abandoned medieval citadel.

This impressive chasm is one of the longest natural underground cavities in the world.

This 5,000-year-old tomb once had its own hinged door.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Play heads or tails with thousands of different coins.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Hundreds of antique bank vault locks on display in New York City.

This small, hidden cove is home to abandoned boats.

Finally, you don't have to be a pious Swedish seaman to relax like one.

Wine bottle sculpture with a ship's stateroom inside.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.