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

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

A mysterious bridge over a sunken Roman road.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

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

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

The Bristol Camera Obscura housed in an ancient windmill.

This enchanting hill is home to fairy lore and a sinister local mystery.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

This antique prison is a tourist attraction with a sordid past.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

The final resting place of soldiers' loyal canine companions.

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

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

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Fantastically decorated underground chambers built in the 1760s.

A breathtaking flower tunnel bursts with beautiful golden blossoms.