A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A fiery crater has been burning in the Karakum Desert since 1971.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Australian museum dedicated to human health and lack thereof.

Naturally formed rock city in Poland.

This star-shaped military outpost is now simply trying to protect itself from neglect.

A seasonal movie monster museum featuring wax creations by a relative of one of the original Universal Studios monsters.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

This subterranean necropolis holds three floors of antler-dug grave caves.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

An underground city of salt.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

A landscape decorated with enormous skull sculptures.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Rising from the sea like a stone monster.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.

Staves, storm-calling, and of course, necropants.

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

The giant skeleton sculpture is surprisingly well-traveled.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.