This enchanting Victorian estate was home to the world's first hydroelectric power generator.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

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

The Great Fire of London and the regulation of one-way streets both started in this alley.

The medieval woodcut-style artwork chronicles life in medieval London.

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

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

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

The pockmarks across the building's facade are remnants of the Blitz.

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

The bronze uniforms commemorate the vital role of women during World War II.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This ancient Egyptian obelisk still bears the wounds of World War I.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

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

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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

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

This coffee shop lies hidden beneath a historic church.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

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

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

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