An abandoned bell tower in the middle of nowhere is the last testimony of a forgotten medieval village.

High in the Italian Alps, a lonely chapel with a striking view of the Matterhorn.

For centuries this cliffside aqueduct was believed to be of Roman origin, but it actually dates to the medieval era.

An abandoned village that resides along the mountains of the Aosta Valley.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

This trail was once used to smuggle cigarettes, sugar, and other black market goods between Italy and Switzerland.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

A massive mausoleum towers over the gravestones in a 19th-century Italian "model village."

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

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

This World War I fortress is the perfect place to catch a Montenegrin sunset.

A beautiful but deteriorating monument of Soviet architecture.

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

With over 10,000 lights, this engineering marvel lights up the city after dark.

Hidden up a dusty track off the Georgian Military Road is this fascinating waterfall with mountainous views.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

Veryovkina Cave is more than 1.3 miles deep—the deepest known in the world.

This extensive collection of vintage Soviet cars is the only one of its kind in the Caucasus.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.