These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

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

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

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

Ancient Greek oracle of the dead.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Giant marble phalluses on the sacred island of antiquity.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This legendary city has been a tourist attraction for centuries.

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

The hallucinogenic center of the ancient world.

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

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

Mysterious standing stone formations looks like a petrified forest.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.