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

Unusual building appears to be haphazardly built from randomly piled bricks.

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

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

These Stalin-era industrial 'death traps' hang lifeless above the city

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

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

Small church on top of a huge rock column.

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

Underground monastery and fortress.

A massive collection of petroglyphs dating back some 40,000 years.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

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

Mysterious hillside with a continuously burning natural fire.

The world's largest dark sky preserve is a Canadian park established to preserve the country's last wood bison.

This concrete residential area doubles as an open-air gallery.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

Tiny memorials honor individual victims of the Holocaust.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.