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Imagine taking a ski lift up through lush green mountains, the sun just rising over the horizon, and stepping off gingerly onto a crumbling stone pillar. You climb to the top and see the whole world spread before you, framed by a mighty ancient wall snaking its way through the mountains, for miles and miles, as far as you can see in both directions. You stare in wonder, and realize the history of this thing – it has stood for thousands of years, and likely many more.