Final answer:
The pyramid building age in Egypt ended around 2200 BCE with the fall of the Old Kingdom, signaling a shift in power from centralized to regional control and leading to the decline of large-scale monumental building.
Step-by-step explanation:
The pyramid building age, a period marked by the construction of the massive stone pyramids, ended around 2200 BCE, which marked the collapse of the Old Kingdom and the start of the First Intermediate Period in Egypt. This end of an era is often associated with the cessation of monumental building projects like large pyramids, palaces, and temples. The last of the great pyramids were built during the Old Kingdom (2613-2181 BCE), such as the Great Pyramid of Cheops, Pyramid of Khafre and Pyramid of Menkaure which were completed by around 2500 BCE.
Despite the decline in pyramid construction, the power structure in Egypt shifted rather than disappeared, with authority decentralizing from the pharaoh to regional nobility. This transition contributed to changes in the social and economic landscape of the country. The pyramids themselves, including the awe-inspiring Great Pyramid, were engineering marvels and remained the tallest man-made structures for nearly four millennia.