Built to hold the worst of the worst of the Nazi war prisoners.

The broken skateboards that became a poignant memorial to a murdered skater.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

A perilous medieval road leading right into the sea.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

The quiet field that inspired one of the most famous songs of all time.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

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

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

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

The only fixed chain and post trail in Scotland snakes its way along the base of a towering seaside cliff.