An intricate and amazing house built by architect Karl Junker.

This unique Renaissance castle was turned into a home for Nazi occultism.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A darkly erotic open-air statuary in Catalonia.

Venice's "Island of the Mad."

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

An alchemist's "magic door" stands in the middle of a Roman park.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Home to three historic ships from the age of Vikings.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Rebuilt remains of a temple to Roman god Mithras.

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

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

The personal charnel house of Anton Bruckner.

Artfully arranged bones of 5,800 Austrians.

Ancient human remains unearthed around the iconic monument.

Famously misunderstood wonder of the ancient world