The ancient civilization credited with building the first known pyramid, the Step Pyramid around 2670 BC, is Ancient Egypt. Commissioned by Pharaoh Djoser and designed by the architect Imhotep, this pyramid is considered a significant architectural advancement. It marked a transition from simple mastaba tombs to complex stone structures, showcasing advancements in engineering and construction techniques. The Step Pyramid served as a monumental burial site and reflected the religious and cultural beliefs of the time, emphasizing the pharaoh's divine status and connection to the afterlife, influencing subsequent pyramid constructions in Egypt.