The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

A sacred lake with thousands of sacred carp and a biblical history.

The ancient abodes are a testament to human ingenuity amid harsh climates.

Ancient serpentine sacrifice holder that has stood the test of time.

Mausoleum and Holy Seat of Antiochus I of Commagene.

A charming beach town in Turkey captures all the colors of the rainbow.

A Turkish monastery tucked into a cliff wall.

Roman ruins, natural methane fires and a lovely beach.

The best-preserved ancient theater in the world.

Ottoman-era houses lovingly preserved.

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

Naturally protected city carved from a rock face.

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

An abused and forgotten metropolis, abandoned for centuries.

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

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

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

The hallucinogenic center of the ancient world.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

You'll find just about anything in this funky Tbilisi flea market.

With over 10,000 lights, this engineering marvel lights up the city after dark.