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

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.

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

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

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

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

Fortified homes of highland warriors that are still in use today.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Underground monastery and fortress.

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

A shrine of fire worship built on top of a natural flame.

Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A gigantic collection of teeny, tiny books.

Mysterious hillside with a continuously burning natural fire.

This man-made mound monument was built out of soil from all across the Polish empire.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.