Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

Luxurious devotion and 500,000 images of Buddha in Myanmar.

Gigantic unfinished stupa and the world's 2nd largest bell.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

China's very own Atlantis is an ornate dynastic city resting at the bottom of a lake.

A centuries-old fortress city lies in ruin.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Model Trains and Much More in Hamburg.

A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

The world's largest reflecting pool is just two centimeters deep.

An Italian hillside ghost town.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This 16th-century monastery has been turned into a surrealist architecture compound.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

This historic cemetery was inaccessible for several years due to dozens of land mines.

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