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

A unique tribute to the millions of animals who served and died for the British military.

An architectural oddity hides in plain sight on this iconic London bridge.

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

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

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

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

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

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.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

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

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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

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

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

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

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

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

An extensive collection of fine art devoted to man's best friend.

Avoid gangster interaction while window-shopping.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This innocent-looking townhome is actually a subway exit.

This industrial chimney looks rather out of place, isolated in the middle of an attractive woodland.