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

A living memorial to the trees London lost during the Great Storm of 1987.

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

The Art Deco artwork depicts gilded carriers of deadly illnesses.

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

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The final resting place to 300 Victorian-era pets hides inside the city park.

Pop culture has helped to keep this iconic British building from being destroyed.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

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

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

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

Where's a guy to go after a long, hard day at work?

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Putting the "mod" in "modular" since 2000.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."