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

The oldest inn in England served brew to the crusaders.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

Catacombs turned marketplace.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A famous burial ground with a history both grim and literary.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

The anatomical-pathological collection of a man who changed surgery.

The most visited, and possibly most controversial, museum in Germany.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Macabre astrological automaton clock dating to the late 1400s.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

Breathtaking and huge 430 year old maps of Italy.

The once highest point in China blends symbolic design with a kick of adrenaline.

Beijing's version of Disneyland, completely abandoned, mostly destroyed.