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

Two thousand feline artifacts fill Malaysia's "Cat City."

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

A mysterious castle built as a monument to lost love.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

A collection of venomous snakes and reptiles for the whole family to enjoy.

Thailand museum of bottles of all shapes and sizes filled with intricate and beautiful art.

This South London cemetery holds the remains of more than 15,000 people.

One of the world's largest collections of pathological specimens.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

The largest known medieval map of the world.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The anatomical-pathological collection of a man who changed surgery.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

Bell tower juts out from a village buried under a lake.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

The footprint of a frustrated devil in Munich's Cathedral.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Terrifically morbid cemetary and site of famous Paracelsus' grave.