re: Ancient civilizations. Y or N?

The reason I am skeptical of very ancient civilizations is population size. There just weren't enough people around back then to make constructing some large buildings worth the trouble. A teepee made of mammoth bones was good enough.

The Great pyramid took something like 20,000 laborers. They built dormatories to house all the laborers and archaeologists have found this evidence.

In the Paleolithic, all of Europe barely had 20k people living there. So where exactly were you going to get these laborers? The population in Africa or Near East was likely larger (better climate) but they were still hunter-gatherers who lived in small tribes.

The 12,000 year old sites in Turkey (they have now found several) were built right around the time agriculture was invented. Indeed, it is believed the first farmers might have lived in Anatolia/Turkey. So it's plausible they were settled at that time, were in the early stages of farming, and already were seeing a population growth.