A network of concealed passageways lies within a busy London Underground station.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

A remarkably well preserved tower dating all the way back to the Iron Age.

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.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This foolish Victorian sea fort was converted to a deluxe hotel.

Pop culture has helped to keep this iconic British building from being destroyed.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

At high tide this strange footbridge appears to have no purpose whatsoever.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Collection dedicated to brands, packaging and advertising.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

A clock designed to run with perfect accuracy for 10,000 years.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.