This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

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

The plunge pool is a surviving relic of a rowdy royal residence.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

A quiet memorial to those who died saving others in the heart of the City of London.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

A Roman spa buried deep beneath the City of London.

These Victorian era devil sculptures were designed to spite a local vicar.

This may be the last of London's wooden pavements, which were once a common sight in the city.

London's amazing modernist public square that never was.

The last four extravagant street signs of London's historic banking street.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

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.