The fairy tale castle of the "fairy-tale king."

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An eerie, derelict amusement park in Berlin.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

An exquisite tunnel of cascading flowers.

Avant garde house of Pierre Cardin on the Cote d’Azur.

Hotel designed around a 16th century Mexican bullring.

Oriental bazaar in the heart of Sarajevo.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

A wellspring of natural Viagra found in Bosnia.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

A war-torn Olympic relic is being overtaken by graffiti and nature.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Rare signs of the former Soviet Union in the Caribbean, though not where you'd expect them.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Strange red rock formations that have been attributed to a higher power for hundreds of years.