A naturally beautiful, seemingly bottomless deep blue spring.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.