If Darwinism True Then Why Greatest Megalithic Constructions Worldwide Built in the Mists of Antiquity During Ice Age?

All of the great ancient megalithic building is confirmed to have happened before the so-called iron age, from Baalbek to Giza, and Greece to Morocco, even across the Atlantic in the Andes, those structures built while too navigators were progressing from Asia across the Pacific as documented in W. J. Perry’s great book The Children of the Sun, megaliths on par with Stonehenge on several islands of the Pacific!