A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

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

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

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

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

A unique tribute to the millions of animals who served and died for the British military.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

This ancient Egyptian obelisk still bears the wounds of World War I.

The broken skateboards that became a poignant memorial to a murdered skater.

In a small Kentish seaside stands the former home of one of the greatest science-fiction writers.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

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

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

A memorial to a dog that inspired rioting in the streets of London.

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

This secluded walkway overlooks a magnificently wild London green space.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.