Naturally protected city carved from a rock face.

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

A Turkish ghost town abandoned in a population exchange with Greece.

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 deadly ancient portal to the underworld.

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

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

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.

Roman ruins top white travertine terraces formed by ancient hot springs.

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

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

An amazing collection of wax anatomical models and terratological models.

This precariously perched fortress was once ruled by a crow-worshipping baron.

The mummified relic of St. Catherine sits forever on a golden throne.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.