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 beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Fantastically decorated underground chambers built in the 1760s.

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

Human-made caves excavated to hide a secret society of wealthy pagans.

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.

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

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

Eyam took steps to quarantine themselves and keep the plague from spreading.

The secret wartime bunker built on the platforms of an abandoned Tube station.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

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

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

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

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

Stonehenge has nothing on Castlerigg’s views.

A museum wholly devoted to juvenescence.