The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A spectacular cave and a beguiling lake.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Tubing through a cave lit with glowworms is a magical underground experience.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

An abandoned asylum where patients have been forgotten but their possessions remain.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Site of a former hidden treehouse in New Orleans.

A museum befitting the city responsible for supplying the majority of the world's LSD.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The ghostly remains of what was once the world's richest copper mine.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.