Britain's tallest megalith towers over the cemetery of a quiet English village.

Modern commuters still pass through this 2,000-year-old Roman archway.

Have a seat with the father of modern computing at this Manchester monument.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

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

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

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

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

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

Great Britain's only hat-making museum.

Modern megaliths form this work of cosmic, Celtic landscape art.

The sign at the garden gate reads: "These Plants Can Kill."

A subterranean playground in an abandoned slate mine.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

The intended purpose of this unfinished Elizabethan building remains a mystery.

After years of slow decline, a derelict Gothic castle is now being restored to life.

Picturesque ruins once held off mighty armies.

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

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

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

England's largest white horse isn't even white.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.