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

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Artists have long been drawn to these atmospheric 12th-century ruins.

Seat of the Duke and Duchess of Devonshire for centuries.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

This former quarry is now a vibrant labyrinth of magical in situ sculptures.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

This disused Cold War bunker has been restored to all of its early 60s glory.

This historic Benedictine monastery brews a booze so toxic that it has often been blamed almost singularly for Scottish hooliganism.

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

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

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

The curious and tiny collection contains some very odd objects.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

The medieval legend behind this holy well was one of the inspirations behind "Alice's Adventures in Wonderland."

A petite castle folly in the English countryside.

After years of slow decline, a derelict Gothic castle is now being restored to life.

These legendary stone steps were once used to haul coffins up the rockface.

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

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

You can spend the night in Dr. Frank-N-Furter's castle.