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

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

A musical instrument played by the sea.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

Roman ruins top white travertine terraces formed by ancient hot springs.

A marvel of Byzantine engineering under the streets of Istanbul.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

A deadly ancient portal to the underworld.

The oldest operating pharmacy in the world features 800-year-old recipes.

The curiosities and wonders of pharmacy in a delightful historic building.

Pompeii's less famous neighbor is still revealing her secrets.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

This is the oldest Roman-made bridge in the city still existing in its original state.

Gods clash with machines in a power plant regenerated as a museum.

This ancient market is often referred to as the oldest shopping mall in the world.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.