A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

The 14th-century ruins are said to contain healing powers.

Two monstrous faces loom over a village in Czechia.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

Every part of this unusual home is built into the sandstone rock.

This former quarry is now a picturesque gorge that hides a sunken lake.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

The rusted creatures wait to be discovered in Prague's botanical garden.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

Ruins of a Carnegie family mansion on Cumberland Island.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

This foolish Victorian sea fort was converted to a deluxe hotel.

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

Once the most densely populated place in the world, this island is now a ghost town.