19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Catacombs turned marketplace.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This restaurant's specialty is "a major enigma for food historians."

One of Europe's oldest libraries.

Hidden in plain sight, this creepy sculpture watches from above.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

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

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

A memorial for public executions that dates back to the 14th century.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

The show's fictional Korean medical camp was created in the Santa Monica hills.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.