This curious, round temple is the oldest still-standing marble building in Rome.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

An ancient rogue artist community hidden next to one of the world's most glitzy and glamorous cities.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

This cliff-face port is considered a masterpiece of mining engineering.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

A fascist-era rural village abandoned since the early 1980s.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

This ancient market is often referred to as the oldest shopping mall in the world.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

Windblown rock formations in an ancient Roman quarry.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A petite white lighthouse perched on the ancient core of Stromboli Volcano.

Mysterious tombstones thought to be remnants of Atlantis.

Fountain where visitors can earn a license to be mad.

This church carved into the rocks is full of enchanting stone statues.

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