This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

The medieval woodcut-style artwork chronicles life in medieval London.

The bronze uniforms commemorate the vital role of women during World War II.

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

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A quiet memorial to those who died saving others in the heart of the City of London.

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

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

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

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

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

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

A war-torn Olympic relic is being overtaken by graffiti and nature.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

The first mosque in the world to receive electricity.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.