This enchanting Victorian estate was home to the world's first hydroelectric power generator.

This 13th century castle is chock full of ghosts and impossibly rare cows.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

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

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This luxury shopping lane has been protected by its own tiny police force for over a century.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Hear the quietest sound from across the dome.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

These planks were originally installed to hold the dead.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

The most loyal of little dogs, or a Victorian era publicity stunt?

These remarkable cascades are the jewels of Upper Tees.

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

Huge winged monument in the United Kingdom.

An underground city of salt.