A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Smoked mummies housed in mountainside caves.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

A church dedicated to the Mexican skeleton saint.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

One of the largest caverns in the world has a maw large enough to stack cathedrals in.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

Host to the annual Festival of the Snakes.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

This huge metal monument is slowly being stripped to its concrete skeleton.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

An extraordinary "City of Caves" carved from solid stone.

Two monstrous faces loom over a village in Czechia.

Possibly the oldest living thing in Europe, more likely a pagan survivor.