Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A man used his Civil War-era fortune to build this sanctuary in memory of his wife.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The Liverpool street made famous by the Beatles is real.

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

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Balconies that have a most unusual accent.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A student driver's nightmare.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

This London plaque marks the spot where David Bowie's famous alien made his debut.

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

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

Most of Britain's gold reserve was secretly stashed here after the start of World War II.