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

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

This 1920s Dutch barge is now a floating bookstore.

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

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

A 18th century graveyard and its astonishing cortege of macabre iconography.

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.

Hear the quietest sound from across the dome.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Northern Ireland's Brobdingnagian stepping stones.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This secret garden has bloomed into London's most unique hub of urban creativity.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

A tribute to an explorer and naturalist often overlooked by history.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

The Great Fire of London and the regulation of one-way streets both started in this alley.