The largest greenhouse in the world is home to over one million types of plants.

Rebuilt remains of a temple to Roman god Mithras.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Museum about life, death, and cannibalism in the Stone Age.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

The glowing blue Nymphaeum of Emperor Tiberius.

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

Giant, pink stuffed rabbit on an Italian mountain.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

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

360° views of the city plus five floors of optical illusions and hands-on science.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

These fantastically named natural pools look like something out of a Scottish myth.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

This 16th-century monastery has been turned into a surrealist architecture compound.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One part antique store, one part curiosities hodge-podge.