The Bristol Camera Obscura housed in an ancient windmill.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

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

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

One part local history, 99 parts gruesome haunted house.

Ship-sized kinetic sculptural fantasy.

An architectural oddity hides in plain sight on this iconic London bridge.

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

The bones of two medieval royal lions were discovered at the historic fortress.

Repository for more than 22 million pickled specimens.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.