A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

A statue honors the children who fought Nazis in Poland.

A hidden art gallery in an abandoned Warsaw fort.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

A museum dedicated to the history of psychiatric treatment featuring a gallery of art made by patients.

A long-disputed lighthouse built on the wrong side of a Finnish/Swedish island.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

It's always game time at Stockholm's only museum devoted solely to video games.

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

Micro-nation based around a nine-story high illegally built tower.

Surreal riveted sea forts once protected the Kent shores from German attack.

Remnants of a Victorian garden feature sitting in public woodland.

The curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The atmospheric road was never meant to be so creepy.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.