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

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

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

It's a mystery why these remains were found with no traces of their bodies in sight.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

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

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

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

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

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

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

This medieval church tower has maintained its clockworks since the 16th century.

A kaleidoscopic warehouse-maze of handmade neon signs.

A wonderfully preserved example of London's 1960s-style high-density, low-rise public housing.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

An artistic tribute to the famous singer, just around the corner from where he was born.

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

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