The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

A modern English garden of eccentric beasts, follies, and oddities.

Abstract dinosaur models in London.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A unique waterfall that some believe attracts the fairfolk.

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

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

This 1920s Dutch barge is now a floating bookstore.

The remains of Crystal Palace Great Exhibition of 1851.

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

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

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

400-year-old garden, restored to beauty.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Eighty million natural history specimens call this gargantuan museum home.

Famously misunderstood wonder of the ancient world

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Hidden beneath the streets of London is a secret subway that only carried mail.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.