Over the centuries, some of the most breathtaking buildings on Earth have been restored many times. Whether they were to make necessary repairs, update designs or adjust to changing needs, all these projects required big bucks.
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When pyramids come to mind, most of us think of Egypt, but pyramids exist in many parts of the world. How were they constructed without earth-moving or heavy-lift machinery? And most of all, why were these amazing structures built?
London without the Tube? New York without its underground scene? Atlantans gliding straight from their MARTA stops to the airport? What would life be like without our underground transportation system?