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

A Turkish monastery tucked into a cliff wall.

The most metal church of all time was built in record time because of an international, pious pissing contest.

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

Roman ruins, natural methane fires and a lovely beach.

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

The best-preserved ancient theater in the world.

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

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

Ottoman-era houses lovingly preserved.

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.

This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

Naturally protected city carved from a rock face.

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.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A meow-velous tribute to a beloved street cat, made famous on the internet.

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.

The ornate miniature mansions were built for Istanbul's feathered residents.

A deadly ancient portal to the underworld.