Where commuters walk through remnants of an ancient Greek necropolis.

The ruined doorway is a portal to the building's turbulent and torturous past.

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

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

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

Legend says this sacred tree was a gift from goddess Athena.

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

This legendary city has been a tourist attraction for centuries.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

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

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

The hallucinogenic center of the ancient world.

A large collection of ancient runestones decorates this university courtyard.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

Legend says this fabled well held part of a mythical Norse tree.

A rare rune stone dedicated to a woman.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Constructed on the ruins of a convent, this tower saved countless lives.

This small island off the coast of Uruguay hosts the largest colony of sea lions and fur seals in the southern hemisphere.

A lookout spot for the Andean condor, at the edges of one of the deepest canyons in the world.

This archaeological site features an early version of today’s refrigerators.