Corrected entry: In the opening scene, humans with hunting tools find Transformers building the Sun Harvester amid mountains so high they are covered in snow. This is to be the site of the Great Pyramids, and within some thousands (thousands, not millions) of years, the mountains have completely eroded down to sand dunes.
cornpone
18th Nov 2009
Correction: It was never stated where this opening scene occurred relative to current day geography. Transformers remained on Earth since this time. During these thousands of years (not millions) the machine could easily have moved.
XIII