This is the largest cemetery in Ireland and the first cemetery museum in the world.

This Scottish bridge seems to compel dogs to leap to their death.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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

Northern Ireland's Brobdingnagian stepping stones.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

Northern Ireland's church-turned-skate park.

The lake that fills and empties itself at random.

Modern sundial uses ancient methods to tell time and date perfectly.

Behemoth, cannon-like telescope operated by generations of Irish earls.

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

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

The ancient tomb acts as a calendar that keeps perfect time.

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

A cluttered and astounding collection of antiquities and curiosities.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

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

An intricately decorated tiny place of worship.

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

The biggest and deepest Cold War bunker open to the public can be found in southeast England.