The inquiry into the potential for ancient civilizations to have operated within a four-dimensional framework necessitates a radical departure from traditional linear historiography. This hypothesis suggests that early human societies did not merely perceive the world through a limited three-dimensional lens but possessed an advanced, perhaps intuitive, understanding of a deeper "spacedepth" dimension that modern theoretical physics is only beginning to formalize. The concept of ancient ancestors living four-dimensional lives implies that the structures, spiritual practices, and linguistic codes they left behind are not primitive artifacts but rather sophisticated remnants of a multidimensional interface with reality. This transition from a heightened ancestral awareness to a contemporary "dimensional blindness" provides a compelling explanation for the enigmatic nature of megalithic architecture and the persistent echoes of higher-dimensional themes in global mythology