According to Science (Archeology) as far as I know, they have found no scheletons, from the period before the flood 4300 years ago, that indicates there were existent giants (human)at that time. How come that we have 100.000 parts of scheletons before the flood and not one of those that were really giants. We know that some animals were "BIGGER" but no trace of human beeings been bigger. The oldest of these BIG animals such as the dinosaures and other speciments, disapeared over 300 millions of year before the "flood".
On the other hand experiments has been done to test various thechniqe to explain how the Pyramids were built, the Stonehenge a.s.f. Some archologist are quite sure that they know the techniqe, using a waste amount of slaves and animal power, such as elephants and others.
Bugbear