Monasteries on rock pillars, once accessible only by frayed ropes.

A Turkish monastery tucked into a cliff wall.

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

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.

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

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Ottoman-era houses lovingly preserved.

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

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

Italian cave with exceptional acoustics and an unsavory history.

Virgil's many-mouthed gateway to the underworld.

A submerged archeological park still holds the wonders of a Roman Sodom.

Pompeii's less famous neighbor is still revealing her secrets.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

Historic medieval fortified city in southwest France.

French commune at the heart of conspiracies.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Baroque celebration of the end of the Great Plague of Vienna.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.