An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This clifftop arch is a natural stunner.

This stately palace, first built in the 16th century, was converted into a prison in 1830.

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

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

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

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

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

The best-preserved ancient theater in the world.

A charming beach town in Turkey captures all the colors of the rainbow.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

On top of a hill, this Catholic church overlooks the most Catholic island in Greece.

Τhis feline monument commemorates fallen soldiers on a field that saw many, many battles.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

Legend says this sacred tree was a gift from goddess Athena.

Where commuters walk through remnants of an ancient Greek necropolis.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

Giant marble phalluses on the sacred island of antiquity.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.