The remains of this 2nd-century Roman temple are incorporated into a modern building.

A beautifully well-preserved ancient Roman villa.

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

The relics of dozens of martyrs are stored in a single chapel.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

The world's first underwater farm is home to more than 700 plants.

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

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

Get buzzed beholding one of the world's largest coffee-machine collections, then step into the café for a specially brewed cup.

This medieval hilltop village was abandoned at the end of the 19th century, after existing for more than 500 years.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

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

A unique Tuscan hideaway acts as an art mecca as well as a hotel.

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

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

The city of Palestrina was built around this magnificent terraced sanctuary dedicated to the pagan goddess Fortuna.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

A rococo room covered entirely in porcelain originally constructed for another royal residence.

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

This overgrown mountain village has been abandoned for nearly a century.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

A brutalist gem towering over the heart of Milan.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.