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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

This one has sailed five times as far as Sir Francis Drake's famous ship.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

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

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

Eighty million natural history specimens call this gargantuan museum home.

London's smallest police station is barely the size of a phone booth.

The curios of pharmacist and collector Henry Wellcome.

An unusual round church in London with a Templar past.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This 11th century tower is said to be the oldest building in Oxford.

Hidden in plain sight, this creepy sculpture watches from above.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Seat of the Duke and Duchess of Devonshire for centuries.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.