A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

A cluttered and astounding collection of antiquities and curiosities.

The curios of pharmacist and collector Henry Wellcome.

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

A haunting collection of the vanished and disappearing natural world.

Used as an example in one of the first dictionary entries for "museum" in 1706.

A gateway to a mysterious network of underground tunnels.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Home to the "Rat King" of Nantes and other wonders of the natural world.

Commonly acknowledged as the only public monument to the Devil himself.

Europe’s oldest natural human mummy.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A house of bones — but nobody is quite sure to whom they belong.

Mexico's astounding mummy museum with "the world's smallest mummy."

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

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

The fairy tale castle of the "fairy-tale king."

A snake farm famous for its venemous varieties.