An enormous steel waterfall is a nod to the substance that shaped Britain's Steel City.

Seat of the Duke and Duchess of Devonshire for centuries.

The oldest surviving glass furnace cone in Western Europe.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

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

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

This studio was home to David Bowie's first single, even if it did turn away the Beatles.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

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

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

A memorial for public executions that dates back to the 14th century.

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

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

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

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

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

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

Eighty million natural history specimens call this gargantuan museum home.

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

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

This striking statue brings a scene from the African savannah into central London.

A network of bells in the pubs and restaurants around Westminster alerts politicians when it's time to cast their votes.