The stately remains of Llywelyn the Great's mighty fortress.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

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.

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.

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

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

This crumbling folly looks like an enchanted left over from Middle Earth.

This haunting stone chasm is a hotbed of mossy rock and English legend.

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

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

A house of bones — but nobody is quite sure to whom they belong.

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

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

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

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

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

A site of pagan worship which still attracts people looking for fairies.

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

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

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

A pagan tradition of draping trees with rags eerily lives on.

Artists and musicians now rule over this former rail station.