Giant naked man on a hillside.

One of England's most famous churches hides a pair of little known architectural treasures.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

19th century tunnels burrowed under Liverpool.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

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

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

A sea cave with a waterfall and Viking past

This one has sailed five times as far as Sir Francis Drake's famous ship.

The most loyal of little dogs, or a Victorian era publicity stunt?

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A house of bones — but nobody is quite sure to whom they belong.

The final resting place of soldiers' loyal canine companions.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Formerly abandoned underground complex to keep royals safe from a nuclear war that never came.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

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

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.