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

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

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

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A network of concealed passageways lies within a busy London Underground station.

A clock designed to run with perfect accuracy for 10,000 years.

Artists and musicians now rule over this former rail station.

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

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

Abstract dinosaur models in London.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

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.

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

This hidden green space is the city's second largest conservatory.

London's old-school healing garden.

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

A mysterious artist-run cabinet of curiosities and library.

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

This 1920s Dutch barge is now a floating bookstore.

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