An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

A petite castle folly in the English countryside.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

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

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

This crumbling folly looks like an enchanted left over from Middle Earth.

This foolish Victorian sea fort was converted to a deluxe hotel.

This haunting stone chasm is a hotbed of mossy rock and English legend.

England's most notorious suicide spot.

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

This tangled English forest looks like something right out of a fairytale.

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

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

A fantastic castle rumored to be the birthplace of King Arthur.

The world's largest collection of witchcraft regalia.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The largest manmade caves in Europe now function as a motorbike club's headquarters.

The mystery of the Putim Ossuary involves a tricorn hat.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

This former quarry is now a picturesque gorge that hides a sunken lake.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.