Notorious artist squat renovated into legal studios.

An enormous, inside-out glass globe built in 1935.

The sign at the garden gate reads: "These Plants Can Kill."

The hidden lair of an alchemist rediscovered in a 2002 flood.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Though its branches are painted bright colors by generations of locals, the tree is said to be a haunted portal to hell.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

This quirky museum will make you question everything, including the shape of the planet.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

A mysterious bridge over a sunken Roman road.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

An ancient artistic garden parlor full of hidden water wonders.

Architectureal fantasy quarter of Rome.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

The world's first hotel built in an abandoned water-filled quarry.

An ultra-modern vista that has been featured in so many films the house is a celebrity in its own right.