The commemorative stone column conceals a secret laboratory.

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 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.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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

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

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

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

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

This hidden green space is the city's second largest conservatory.

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 plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

Public access to clean drinking water was an instant hit among the masses.

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.