A sea cave with a waterfall and Viking past

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

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

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

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

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

This giant wooden treehouse within a sprawling garden has its own eatery.

The oldest candy store in the world has been selling traditional sweets since 1827.

A century-old tradition has culminated in a small but singular collection of feline effigies.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

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

The abandoned transportation hub hides within the Glasgow attraction it once served.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

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

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

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

Scotland's only funicular railway is also the United Kingdom's highest.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Ship-sized kinetic sculptural fantasy.

England's most notorious suicide spot.