This mountain trail inspired Nietzsche to complete his magnum opus.

A subterranean display of public art and architecture.

An abandoned train station in Munich constructed for the 1972 Olympic games.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

Science meets wall art to highlight the beauty of famous mathematical equations.

An ingenious Dutch land art project uses grass ridges to cut airport noise pollution in half.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

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

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.