A church of bones, decorated with 40,000 human skeletons.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

This massive library holds what was once the largest book collection in the world.

Notorious artist squat renovated into legal studios.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Get three sheets to the wind at this desert winery with a nautical theme.

Colorful Native American paintings are hidden within this small cavern.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

Acres of natural wonders left behind by a socialite-turned-gardener.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

Seattle's own bad art museum located inside Cafe Racer.

The home of one of California's most important horticulturalists wilts amidst a lovely park.

The ruins of the castle that chemicals built.