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

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A historic arboretum and non-conformist, non-denominational park cemetery.

Surreal riveted sea forts once protected the Kent shores from German attack.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

This London plaque marks the spot where David Bowie's famous alien made his debut.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

A Roman spa buried deep beneath the City of London.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

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

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

Hear the quietest sound from across the dome.

Famously misunderstood wonder of the ancient world

An unusual round church in London with a Templar past.

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

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

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

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.