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

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

The sculpture of the deceased cockatoo flops atop its personal plinth.

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

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

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

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

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

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

Dictionary Johnson’s favorite feline.

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

A domino effect created with Britain’s iconic telephone boxes.

A naturally mummified 2,000-year-old man.

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

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

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

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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