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 Turkish monastery tucked into a cliff wall.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Roman ruins, natural methane fires and a lovely beach.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The best-preserved ancient theater in the world.

Ottoman-era houses lovingly preserved.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

Step back in time and witness the fall of Constantinople.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

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

Naturally protected city carved from a rock face.

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

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

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

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.

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

A deadly ancient portal to the underworld.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.