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

A clock designed to run with perfect accuracy for 10,000 years.

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.

Artists and musicians now rule over this former rail station.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Surreal riveted sea forts once protected the Kent shores from German attack.

The largest greenhouse in the world is home to over one million types of plants.

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

A unique waterfall that some believe attracts the fairfolk.

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

400-year-old garden, restored to beauty.

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.

The final resting place to 300 Victorian-era pets hides inside the city park.

A little slice of Japan and its aesthetics in London's Holland Park.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This tangled English forest looks like something right out of a fairytale.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

This 1920s Dutch barge is now a floating bookstore.

The longest hedge maze in the world.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A student driver's nightmare.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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