Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

An archway adorned with vulnerable flora and fauna.

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

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

This Underground station has been a popular filming location for decades, even before it closed.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

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

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

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

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

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

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

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

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

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

A Roman spa buried deep beneath the City of London.

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

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

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Rebuilt remains of a temple to Roman god Mithras.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

The cedar tree in Highgate Cemetery earned its title by accident.

Dictionary Johnson’s favorite feline.