An enormous alien invades Woking, England, as an homage to the H.G. Wells classic 'The War of the Worlds.'

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

The world's largest museum devoted solely to the whirlybird comes complete with its own chopper graveyard.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

The Bristol Camera Obscura housed in an ancient windmill.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

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

Quirky Welsh observatory unites art and science.

Go deep down into the earth to experience the world of Welsh coal miners.

Stroll through Welsh history in a village of reconstructed structures.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The castle still holds traces of the abandoned Roman fort it was built atop.

The largest of only eight working transporter bridges left in the world.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

The only medieval bridge in Britain with its defensive tower still in tact.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

One of the world's first dedicated bank buildings in the world is now the oldest one.

Stockholm's narrowest alley is barely over two feet wide.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's tiniest statue is of a small boy looking at the Moon.