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The human build structures that are supposed to last the longest are the pyramids at Giza. In their 4000+ years that they are there the desert winds have hardly touched them. Most erosion came from mining the stones to build Caïro. It's incredible how fast stone structures can decay though. A few years ago I walked the Colorado Trail and found several almost dissappeared villages in the mountains that were abandoned less than a hundred years ago. The only remains were rusty boilers, cooking pots and shattered window glass. Nature can be very resilient. Just look at Tsjernobyl.