A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

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

The Tudor-style cottage in the middle of the square is not quite what it seems.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

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

A little slice of Japan and its aesthetics in London's Holland Park.

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

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

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Dictionary Johnson’s favorite feline.

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

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

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

Remnants of a Victorian garden feature sitting in public woodland.

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

A student driver's nightmare.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.