An ethereal glowing blue ocean cave in Croatia.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

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

This professional clown's home is an outsider art wonderland.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

A landscape decorated with enormous skull sculptures.

A modern English garden of eccentric beasts, follies, and oddities.

The largest known medieval map of the world.

Gigantic natural towers in a Russian plateau.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

Thanks to this small string of islands World War II still hasn't officially ended between Russia and Japan.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This influential Renaissance-era library was once the haunt of kings and monks.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

One of the cave cities of Crimea, built by the Goths in the sixth century.

At this cemetery, artists are invited to design their own gravestones.