Commonly acknowledged as the only public monument to the Devil himself.

The world's most active stratovolcano is almost always erupting.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A dead saint, a deadly poison, and a mysterious holy ooze.

An ancient knight and a symbol of the city's freedom.

Controversial site of what could be Europe's first pyramid.

Oriental bazaar in the heart of Sarajevo.

Bridge that died in war and was resurected.

A curious cave church carved into the face of a cliff.

Southern Italy's spinning top village.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

A deadly ancient portal to the underworld.

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

Turkish adventurer antiques in the heart of the Grand Bazaar.

Step back in time and witness the fall of Constantinople.

A marvel of Byzantine engineering under the streets of Istanbul.

Mediterranean castle on a tiny Turkish island.

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