Building the Great Pyramid
"Core of pyramid consists of some 2.5 million stones, averaging 2.5 tons each.
"Von DŠniken scoffs at using rollers to move the stones:
I shall be told that the stone blocks used for building the temple were moved on rollers.  In other words, wooden rollers!  But the Egyptians could scarcely felled and turned into rollers the few trees, mainly palms, that then (as now) grew in Egypt, because the dates from the palms were urgently needed as food and the trunks and fronds were the only things giving shade to the dried-up ground. (Chariots, 94)