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

Mysterious hillside with a continuously burning natural fire.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

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

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

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

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

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

Fast food feels like fine dining at this award-winning modern Georgian building.

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

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

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

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

The first skyscraper to include a Ferris wheel built into the facade.

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

Underground monastery and fortress.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

One of the largest squares in Europe contains an entire artificial island.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Italy's only urban waterfall has enchanted artists and travelers for centuries.

This medieval city gate is now a blend of the past and the modern world.