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

This coffee shop lies hidden beneath a historic church.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

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

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

Banksy gives themself artistic license with this piece of London street art.

The London statue that imitates passersby.

Artists and musicians now rule over this former rail station.

Where condemned pirates met their grisly end at the gallows on the River Thames.

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

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

Ship-sized kinetic sculptural fantasy.

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

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

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

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

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

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

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.

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

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

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

This site was once home to Henry VIII and Elizabeth I.