A Roman spa buried deep beneath the City of London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

The ritual has been performed uninterrupted for nearly 700 years.

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.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The taxidermied remains of a once-great parrot.

An unusual round church in London with a Templar past.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

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

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

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

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

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

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

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

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.