At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

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

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

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

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A perfectly preserved hill village where the buildings are painted like white lace.

A unique hotel for the artistic soul.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

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

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

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

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

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

Ottoman-era houses lovingly preserved.

Naturally protected city carved from a rock face.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

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

An abused and forgotten metropolis, abandoned for centuries.

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

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A marvel of Byzantine engineering under the streets of Istanbul.