The second largest in the world, this massive underground void has its own subway.

A museum glorifying the life of Stalin, located in the city of his birth.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

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

The last standing example of an ancient district's teatime tradition.

The decaying remains of a once-luxurious Soviet spa town.

Small church on top of a huge rock column.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

The observation point offers spectacular views of the ruins of an ancient Armenian capital.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

A geological oddity topped with a 2,000-year-old pagan temple.

Propped high atop the peak of Mount Gamsutlmeer, this abandoned village is one of the oldest settlements in the region.

An enormous Soviet aircraft, the only one of its kind, stands at the deserted shore of the Caspian Sea.

Since the 1960s, this small village has invited painters to decorate its walls.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

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

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.