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

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

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

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

Two plaques commemorate the site of Shakespeare's first theatre.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

Eclectic final resting place of the controversial explorer.

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

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

Pop culture has helped to keep this iconic British building from being destroyed.

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

This London plaque marks the spot where David Bowie's famous alien made his debut.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

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

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

Collection dedicated to brands, packaging and advertising.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

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

The television series' iconic giant foot was borrowed from this classical painting.