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

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

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

Murals of the wild parties once held on the frozen River Thames.

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

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

A tiny replica of the iconic London landmark hides on the side of the steel structure.

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

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

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

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This five-star hotel was originally a swanky parking garage.

This mysterious and unique painting is filled with symbolism.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

This striking statue brings a scene from the African savannah into central London.

A recreation of a sign that Charles Dickens used to see on his walk home.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

A tongue-in-cheek arcade where the games are based on everyday life.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.