Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

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

This tiny little pool is said to be home to a malicious mermaid named Jenny Greenteeth.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

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

Left by the Devil, an ancient quarry or just plain old erosion, this enigmatic rock pillar rises 28 feet from the hillside.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

Quaint, disturbing, and macabre objects are all on display at this intriguing collection of medical instruments from bygone eras.

This reconstructed ancient fort was home to one of the few horse training rings in the Roman Empire.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

This medieval manor house was equipped with secret compartments for hiding priests.

An open air haven for tropical monkeys in the damp moors of the English country.

The gravestone of a delicate singer-songwriter bears a fittingly introspective epitaph.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

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

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

Some wattle-and-daub, a Moorish mural, a glacial erratic, and a Giant named Gilbert.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.