Yes I have heard of cranial reshaping. But I think the giveaway in this case is the world wide consistency with this one particular theme of extraterrestrials imparting knowledge and technology.
For example, the stature of these beings that descended from "heaven" above- throughout the world is depicted as "giant" in stature- 10 feet or so.
Here you can see the Gods and their descendant hybrids with the larger craniums. The headresses worn are used to conceal the larger heads of these beings.
Regarding the pyramid and the Stonehenge, a very good read is "When time Began", Zechariah Sitchins 4th book on the extraterrastrial origins of humanity. It goes into much detail providing a very convincing case that even the most skeptically minded cannot dismiss.