These morbid carvings remind churchgoers of the inevitability of death.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A museum wholly devoted to juvenescence.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

One of the world's largest collections of pathological specimens.

Remnants of a Victorian garden feature sitting in public woodland.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

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

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

A faded reminder of what was once a common sight in London during the Blitz.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

A collection of machines designed to break things for science.

The taxidermied remains of a once-great parrot.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

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

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

This 1920s Dutch barge is now a floating bookstore.