These warring psychedelic crags commemorate an unsuccessful military operation.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

These Nubian pyramids are strange and unique, even by pyramid standards.

Dating back to 1812, this is the oldest racecourse in the Southern Hemisphere.

This small group of sand dunes manages to pack in a strange rainbow of colors.

The bridges portrayed on EU currency aren't fictional anymore.

Watch the local Netherlands birds from inside this giant eco-egg.

Peek through a transparent pyramid and drink in the mountain made of books.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

This abandoned oil depot produces world's longest echo in a manmade structure.

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

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

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

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

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

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

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

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.

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

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

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