Geothermal waterfalls in Tuscany.

This Gothic revival structure has been a family home, a military base, a gymnastics center, and is now owned by one of the largest auction houses in Italy.

Catacombs turned marketplace.

A lover's walk between hilltop towns, decorated with graffiti love notes.

This historic line is a remnant of an ambitious and unconventional project that today provides panoramic views of the Ligurian mountains.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

A brutalist gem towering over the heart of Milan.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Historic medieval fortified city in southwest France.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

This ancient theater was once the home of fierce gladiatorial battles.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

For hundreds of years, this huge figure has been blessing visitors before they explore his body.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

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

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

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