In our new Telegraph video series we examine some of the costliest, biggest, tallest and longest man-made structures that exist in the world today. In this video, we look at the top five longest walls in the world, including the Ancient Walls of Babylon that stretch over 56 miles, and Hadrian’s Wall that took 15,000 men and over six years to build.
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Telegraph.co.uk and YouTube.com/TelegraphTV are websites of The Daily Telegraph, the UK's best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.
