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

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

A 200-year-old collection of oddities and medical paraphernalia.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

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

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

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

A famous burial ground with a history both grim and literary.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

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

Possibly the oldest living thing in Europe, more likely a pagan survivor.

London's largest outsider art museum.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

A village on the east coast of England that has almost completely eroded into the North Sea.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

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

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This cramped crevasse saw the entire population of its island suffocated inside its depths.