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

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

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

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.

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

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The television series' iconic giant foot was borrowed from this classical painting.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A tongue-in-cheek arcade where the games are based on everyday life.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The lasting remains of a bygone era of open-air meat markets.

Dedicated to one of the nation's worst engineering disasters.