>>33641
Many of those things HAVE been found, but…
Glaciers wipe out, grind away, whatever is beneath them, esp 2-3 mile thick glaciers that travel close to what we call the tropics today in both hemispheres. Since oil wasn't used, no plastics to last thousands of years. Most metals corrode and rust, sand on strong winds over time tears apart or buries everything, even stone. Only ruins, shadows of a great past are left behind, pebbles, damaged remains of cities and temples, like Puma Punka. Imagine what lies out there in the Sahara under all of that sand or in the southwestern USA, or the rain forests of South America. The pyramids and the sphinx were buried, and all of that desert was verdant green before the glaciers retreated and it all became desert again, and the winds exposed a few things. Underwater temples and citadels have been found off of Japan and on the Islands of Indonesia, and many cities lie under the Mediterranean sea .
Pebbles are all that remain of what we have found so far. Gobeckli Tempai (sp?) had been buried, and how many others are out there to really screw with scholars' heads.
Afterwards, if anyone at that time had come to the recent ruins of one of those cities, they would probably have scavenged for anything of any use to help with their survival, gutting any standing buildings. (Stonehenge stones were knocked over and broken up for building materials.) It has been put forward that the great pyramid had been filled with things that fit into regular sockets, but whatever was in those sockets has long been removed. Think like the scavengers in the movie, 'The Book of Eli'. If they had come across a factory or power plant, they wouldn't know what it was for, but they could certainly find a use for a lot of the stuff inside of it to help them survive, and it would be emptied to a shell, just like the pyramid.
Eventually, time, weather, climatic upheavals, and sprawling nature reduces everything back to its original state, chaos. That's entropy for you. The great equalizer (Or neutralizer, if you prefer.)
Expecting delicate artwork to survive the millennium? Only if it was stone and buried.