Mysterious tombstones thought to be remnants of Atlantis.

This cliff-face port is considered a masterpiece of mining engineering.

Ancient cave tombs known as the "houses of fairies."

Stalactites and stalagmites in a beautifully lit cave.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

A 16th-century horror show built in a lovely Italian garden.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A psychedelic labyrinth on the San Francisco bay.

You don't want to get caught in this trap--or do you?

An unreal vintage shop that wears its dadaist influence on its zombie fish.

New Zealand's epic shrine to all things puzzling.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

A hand-built folk art installation covered with messages of God's love.

World's largest collection devoted to one fruit.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Abstract dinosaur models in London.