This 1920s Dutch barge is now a floating bookstore.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

A secluded green oasis amidst the towering skyscrapers, bears an unusual moniker that reflects one of the city's oldest guilds.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

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

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

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

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

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

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.

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

The taxidermied remains of a once-great parrot.

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

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

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

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

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This Underground station has been a popular filming location for decades, even before it closed.

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.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.