The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

Visit the WWII bunker where the British won the battle for the skies.

Asthmatic Charles Hyett's son built a fantastical garden for his father to convalesce in, alas it was too late.

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

A mysterious bridge over a sunken Roman road.

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

These medieval tunnels provided water to the city above through centuries of civil war and plague.

The ancestral home of beloved English poet Lord Byron has a bizarre history.

The twists and turns of this serpentine maze are over 170 years old.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

Seat of the Duke and Duchess of Devonshire for centuries.

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

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

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

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

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

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

A petite castle folly in the English countryside.

Eyam took steps to quarantine themselves and keep the plague from spreading.

Human-made caves excavated to hide a secret society of wealthy pagans.