A little-known ruin with a convoluted history and a fascinating latrine drainage system.

Rare collection of medieval books under lock and key.

Fascinating town where normal life interfaces with the occult.

A naturally mummified 2,000-year-old man.

Museum celebrating the history of computers, especially their role in codebreaking.

On a site with a long military history, a 1980s shelter.

A collection of early 19th century trams set in a reconstructed period village.

Once a palace for the Archbishop of York, these 15th-century ruins now serve as a haunt for history buffs.

This English medieval castle is where King John died of dysentery.

The first museum in the world devoted to sexual gadgetry.

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

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

The oldest warship in Europe is still afloat.

A curious urban windmill once owned by a renowned British mathematical physicist.

A vortex fountain that seems to rise out of the ground.

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

Great Britain's only hat-making museum.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

This mummified mermaid corpse is an aquatic curio that was eventually revealed to be a fake.

The largest known medieval map of the world.

This memorial honors the first British soldier killed by enemy action on home soil during World War I.

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

Ancient human remains unearthed around the iconic monument.

This poignant WWI memorial looks like a lighthouse 100 miles from the sea.