A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

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

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Protecting the dead from opportunistic body snatchers.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Vibrant street art created with mixed media.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

This small Irish village suffered the greatest loss of life when the Titanic sank.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

Local legend says there's treasure hidden within its crowded graveyard.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

Whimsical woolen creatures have taken over this historic Northern Ireland park.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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