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

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

The only ancient site that remains on the south bank of the sacred Ilissos river.

According to legend, this ancient column contains healing properties.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

Large collection from the 3rd millennium BCE.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The absurd creation is a compulsory destination for selfies in Buffalo.

This 1st-century CE Roman bath sits under a carpark.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The hallucinogenic center of the ancient world.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

The most visited, and possibly most controversial, museum in Germany.

Road signs in Namibia mark the location of one of the five major circles of latitude.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

A perilous medieval road leading right into the sea.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

A 16th-century horror show built in a lovely Italian garden.