Mummified monks and the accidentally interred, in a 17th-century crypt.

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

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Europe's second largest ossuary wasn't discovered until 2001.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Walk through Czech history in Prague's largest graveyard.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

Picturesque intersection of witchcraft and ancient Christianity.

The stunning interior of this Gothic church is covered in ornate gold details.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A submerged village appears when dam levels drop.

This small chapel is built of human bones and decorated with a golden skeleton.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Hauntingly beautiful totem poles left by the Haida.

The stunning remnants of this wreck emerge from an otherworldly backdrop of rainforests.

This old wooden funicular railway leads to a cemetery in the forest.

These jeweled relics have a scandalous and contested past.