This overlooked street light once served as a KGB dead letter box.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

Taxidermied animals galore, by appointment only.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

A quiet memorial to those who died saving others in the heart of the City of London.

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

A memorial to a dog that inspired rioting in the streets of London.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

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

The remains of the great moral philosopher reside in a university in London.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

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

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.

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

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

The monster at the center of the Darwin Center Spirit Collection.

Dictionary Johnson’s favorite feline.

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

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

An artistic tribute to the famous singer, just around the corner from where he was born.