The abandoned funicular tunnel was a secret base for the BBC during World War II.

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

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

A friendly pub with a sordid past in cock fighting.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

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

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Fascinating town where normal life interfaces with the occult.

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

The decaying ruins of Wales' first asylum for the mentally ill.

London's old-school healing garden.

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

400-year-old garden, restored to beauty.

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

Eighty million natural history specimens call this gargantuan museum home.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

One part local history, 99 parts gruesome haunted house.

Famously misunderstood wonder of the ancient world

Banksy's image of a naked man dangling from the window of a sex health clinic.

One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.