England's most notorious suicide spot.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

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

A 550-square-meter micro-nation off the coast of Britain.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

The commemorative stone column conceals a secret laboratory.

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

London's marvelous wildfowl reserve along the Thames.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

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

Charles Babbage's proto-computer, painstakingly brought to life.

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

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

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

Hear the quietest sound from across the dome.

A student driver's nightmare.

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 perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

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