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

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

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

A midnight snack that lights up the night.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

Cliffs full of fossils at the portal to England's Jurassic Coast.

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

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

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

Fantastically decorated underground chambers built in the 1760s.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A relic of Victorian grandeur hides beneath a busy South London road.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

Stonehenge has nothing on Castlerigg’s views.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

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

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.