Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Legend has it fairies gathered at the site of this medieval castle.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

Yugoslavia's biggest underground airport lies in ruins.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

This road earned its macabre nickname after hundreds of Iraqi troops died along it in 1991.

Wander among the ghostly ruins of an island where civilization flourished for thousands of years.

The palace of the King of Kings, burned by Alexander the Great.

Ghost Town in the Demilitarized Zone of the Golan Heights.

Named for the biblical warrior, the largest castle in Israel actually dates to the Middle Ages.

Disturbing winged beings decorate the walls of this strange abandoned hermitage.

Remote, beautiful, and stigmatized, Las Hurdes is Spain's version of Appalachia.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

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

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

This small Spanish village is home to dozens of public paintings meant to trick the eye.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

A modern-day cabinet of curiosities housed in a 300-year-old inn.

A taxidermied stork with an arrow through its neck proved that birds migrate.

The cave where Saint Genadio meditated and played chess.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.