On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A library where thousands of books explain how to avoid another Great Recession.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

This enchanting hill is home to fairy lore and a sinister local mystery.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The stately remains of Llywelyn the Great's mighty fortress.

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

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

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

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

England's most notorious suicide spot.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

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

This Manchester laundromat is hiding something.

A 200-year-old prison that now houses a peculiar crime museum.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.