The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

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

Folklore and history carved into Brittany's coast.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

This grave resides at the crossroad of three parishes.

The first island in the world designated a light-pollution-free astronomical observation point.

Medieval Danse Macabre Fresco in Northern Brittany.

Housing the groundbreaking maps and globes of Gerard Mercator.

Theme park featuring miniature replicas of European monuments.

Cozy basement bar sports an inventory of over 2,000 beers.

The earliest known map to show America, discovered by accident at a Paris bookshop.

An ancient Egyptian temple in the middle of Madrid, Spain.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The corpse bride of Portugal.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Constructed in the 1920s, this former pencil factory is now an office building.

Where Greenpoint's first European settler—and troublemaker—made his home.

Known as the "Forgotten City" it was home to industry, riots, artists, squatters, and to one of the largest single disaster fires in New York City.

Four cars from the old system were once on display, but were removed in 2014.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).