This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

One of the few cold geysers in Europe, its eruptions are powered by carbon dioxide.

This 18th-century project to build the world's tallest gravity dam was never completed.

A hole in the floor of this chapel is said to have been created by a footprint of the devil.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

The longest cutting on the M62 contains some surprises—though it's best to leave the motorway to appreciate them.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

A stunning blue-green lake located in the Terskey Alatau mountain range.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

A relic of the Cold War tucked away in the forested hills above Bratislava.

An 18th-century viewpoint across the surrounding highlands.

A musical instrument played by the sea.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.