Quirky Welsh observatory unites art and science.

A mechanized clock where a man fights off a dragon, crab, and rooster.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The first green space constructed on an elevated viaduct.

A museum in England’s Lake District dedicated to the trusty pencil wants you to know the story of their World War II spy pencils.

Stonehenge has nothing on Castlerigg’s views.

The sign at the garden gate reads: "These Plants Can Kill."

A glacial pothole was once a hideout for a notorious Scottish outlaw.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

A perfectly running 230-year-old silver automaton and music box.

The legend of a monkey that was hanged as a spy has inspired not only a football team name, but a successful mayoral campaign.

Built in 1911, the Tees Transporter Bridge is one of only six transporter bridges still in operation.

A locomotive made from 185,000 bricks celebrates the town's pioneering railway history.

Lavish royal estate punctuated with heated greenhouses.

Climb inside an iron crystal magnified 165 billion times its normal size.

A hands-off space for graffiti artists to hone and display their skills.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

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

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