This ornate mosque is said to hold the remains of Muhammad's granddaughter beneath its dome of pure gold.

The Syrian headquarters of alleged hashish-smoking assassins.

Mysterious lost empire of the Silk Road.

Ruins of the Crusaders' headquarters.

The eclectic home of a leading Turkish architect is a gorgeous piece of eye candy.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

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

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

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

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

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

Mausoleum and Holy Seat of Antiochus I of Commagene.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

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

A Turkish monastery tucked into a cliff wall.

Naturally protected city carved from a rock face.

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

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

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

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

The world’s largest LED display, built over an F1 race circuit.

This artificial archipelago was supposed to resemble a map of the world.

A faithful reproduction of Al-Jazari's enormous water clock.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."