This natural gas vent certainly earns its name as the smallest volcano in Italy.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

Haunting graffiti left by prisoners of the Spanish Inquisition.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

A massive marble foot is tucked away in a small alley near the Pantheon.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

An eerie, little-known Neapolitan museum filled with preserved human remains.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

A madman's personal garden filled with 1,000 sculpted heads.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Its interior is adorned with some of the best examples of early Christian mosaics.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

Bell tower juts out from a village buried under a lake.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.