Statue of a decomposing prince that once held his heart in its hand.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

A spherical "micro-nation" in the heart of Vienna.

A 30-acre garden inspired by the principles of modern physics.

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

Northern Ireland's Brobdingnagian stepping stones.

The lake that fills and empties itself at random.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

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

The monster at the center of the Darwin Center Spirit Collection.

The remains of the great moral philosopher reside in a university in London.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Public access to clean drinking water was an instant hit among the masses.

A cluttered and astounding collection of antiquities and curiosities.

A tongue-in-cheek arcade where the games are based on everyday life.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

The curios of pharmacist and collector Henry Wellcome.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.