The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

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

Follow the original medieval paths that wind through this intriguing section of the city.

A open air theatre built on a cliff by an eccentric British woman.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Stonehenge has nothing on Castlerigg’s views.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

The cedar tree in Highgate Cemetery earned its title by accident.

Pop culture has helped to keep this iconic British building from being destroyed.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

England's most notorious suicide spot.

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

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

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

A naturally mummified 2,000-year-old man.

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

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

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

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

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

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

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

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.