These thermal springs were once popular with residents of a nearby Roman colony.

Every half hour, the flow of this unusual spring cycles between a rush of water and barely a trickle.

The site of the first medieval crusade that pitted Christians against Christians.

The world's largest concentrated solar power plant.

In this desolate valley resides a gorgeous set of rocks sporting a technicolor design.

God's Saharan sandbox of wrath.

Crumbling necropolis set high above Fez.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Traditional 11th-century outdoor tannery.

This 47-story "M" needed 20 years to be completed

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

The world's tallest bridge is also possibly the most elegant.

Astonishing rock formations dot the Brimham Moor landscape.

The oldest candy store in England has been selling traditional sweets since 1827.

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

This collection of ancient structures makes up part of the largest group of prehistoric earthworks in Britain.

Each year this small English village becomes overrun with outlandish straw men.

A winding medieval path was used by mourners to carry their dead to the nearest church.

At 1,732 feet above sea level, this spectacularly isolated yet surprisingly bustling bar is the highest pub in Britain.

The dramatic remains of an abandoned farmhouse sit high on the edge of a remote hillside.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

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

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

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