Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

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

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

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.

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

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

This sanitized yet surreal depiction of a Greek fertility god looks over a square in one of central London’s residential areas.

A lasting remnant of the London Blitz.

A faded reminder of what was once a common sight in London during the Blitz.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A network of bells in the pubs and restaurants around Westminster alerts politicians when it's time to cast their votes.

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

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

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.