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

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

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

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

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

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.

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

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

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

Artists and musicians now rule over this former rail station.

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

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

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

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

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

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

You can cross from one country to another in a single hop on this little bridge.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.