This disused VLF radio station is no longer in service but the surrounding town still bears its name.

Germany's longest suspension rope bridge.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

This castle-fortress is a living example of the transition from medieval defenses to modern fortifications.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

An early 20th-century bullring converted into a modern shopping center.

The last bastion of Roman presence north of the Alps looms over a German town.

Descend into the tunnels to experience the life of a coal miner.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

Hiding the longest subterranean river known in the world.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

Abandoned since 1998, this train station has become an oasis for urban explorers.

The tallest mountain in mainland Netherlands isn't actually very tall.

Incredible labyrinth of man made caves.

Moscow's imposing monument to the Space Age.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.