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

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

Explore the quarry where the marble was sourced for Michaelangelo's David.

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

142 ceramic steps become a mosaic once a year.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

One man's quest to fix his toilet unearthed over 5,000 artifacts spanning more than 2,000 years of history.

This is the oldest Roman-made bridge in the city still existing in its original state.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

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

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

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

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

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

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

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

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

Roman-era ships unearthed...