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What does it take to safeguard the world's most famous places? How do you maintain buildings that are thousands of years old? How do you secure a historical structure that contains millions of dollars worth of artefacts? In this new series, we take you on an exclusive, all-access tour behind the scenes of select UNESCO World Heritage sites to illuminate the work that goes into running and maintaining these treasured monuments, buildings, national parks and even entire cities, ensuring that they survive in the best possible conditions for future generations to enjoy. (National Geographic)