This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

A rare chance to ride one of the few continuous elevators still in operation.

The tiny, studious rodents greet visitors to the National Archives of Finland.

A rehabilitation center for confiscated, orphaned, and abandoned chimpanzees.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Housing the groundbreaking maps and globes of Gerard Mercator.

This bike path traverses the treetops.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

A silly medieval mural preserved on the side of a Viennese house.

A bike train runs along a disused railway line through the tranquil French countryside.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A public urinal so pretty, it was declared a national monument.

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

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.