The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

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

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

Fantastically decorated underground chambers built in the 1760s.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

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

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 secluded walkway overlooks a magnificently wild London green space.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

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

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

This London plaque marks the spot where David Bowie's famous alien made his debut.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

Museum about life, death, and cannibalism in the Stone Age.

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