The world’s second-largest flood defense barrier has protected London for decades.

This secluded walkway overlooks a magnificently wild London green space.

Catacombs turned marketplace.

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

This tribute to the fictional detective stands at the famous literary character's address.

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

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

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

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

Giant, friendly pelicans in Central London, the most unlikely of places.

The bronze uniforms commemorate the vital role of women during World War II.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

Once part of a magnificent Tudor palace, this wine cellar is a time capsule underneath the Ministry of Defence.

London's smallest police station is barely the size of a phone booth.

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.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The television series' iconic giant foot was borrowed from this classical painting.

These ornate arches show how the course of the River Thames has changed.

This ancient Egyptian obelisk still bears the wounds of World War I.

England's most famous front door has an accidental doppelganger.

An unusual round church in London with a Templar past.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.