The best-preserved ancient theater in the world.

Flames have been burning within this mountain for more than 2,500 years.

1513 Turkish world map, full of European state secrets and snarky commentary.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A Turkish ghost town abandoned in a population exchange with Greece.

An abused and forgotten metropolis, abandoned for centuries.

This famous city eluded concrete detection until the early 2000's.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A marvel of Byzantine engineering under the streets of Istanbul.

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

At this ancient settlement at the foot of Mount Babadağ, honeycomb tombs are carved into a round cliff.

One of the most exquisite Lycian hilltop citadels in Turkey.

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

Hidden just under the waters around this Turkish island are the ruins of a once great city.

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

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

This Victorian graveyard in Leeds is a macabre collection of beautiful tombs and memorials.

The only surviving leech house in the United Kingdom was a home for bloodsucking worms until the 1900s.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.