I have little doubt that prior civilizations rose and fell, lost to the mists of legend or faded completely out of memory.
I expect the largest pre-Ice Age and contemporaneous cities are under water, flooded when sea levels rose during and after the thaw, most likely in the tropical latitudes.
Proving it is another matter. I want to see the evidence.
A water well driller I knew claimed to have pulled up a piece of brass while drilling a water well through glacial till here in ND, which would have made it over 12,000 years old (Pre-Clovis) if it actually came from below the Laurentide Ice Sheet till layer.
I never saw the piece, and as far as I know it is lost.
It would have been interesting to see if it was relatively modern junk that fell down the hole as it was being drilled, plucked from a shallow sidewall, or truly an anachronistic discovery.
But, as with all else in science, for every question answered, more are raised.
The more we learn, the less we know.