This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

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

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

Accessible only at low tide, the deserted island is dotted with World War II ruins.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

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.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Spend the night in this formerly abandoned traditional Scottish village.

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

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

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

An incarceration museum on the spot of possibly the oldest prison in England.

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