Where Agatha Christie mysteriously disappeared in 1926.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

Modern commuters still pass through this 2,000-year-old Roman archway.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.

The tallest freestanding structure in the United Kingdom.

This 600-year-old tower was built as a comfy residence for cherished pigeons.

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

The English Civil War began right here in 1642.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

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

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

A 13th-century inn where the ill-fated King Charles I spent his last night of freedom.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

The tradition of using flowers to decorate wells is once again thriving in England.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

The heroic tale of a remarkable pup who refused to leave her master's side, no matter what.

This jewel of an engine is one of Northern England's finest surviving legacies of the Industrial Revolution, even catching the eye of Henry Ford.

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.

The undercroft is a spectacular example of medieval Cistercian architecture.