Which ancient civilization is known for building the pyramids?

The ancient civilization renowned for constructing the pyramids is the Egyptians. The most famous pyramids, such as those located at Giza, served as monumental tombs for pharaohs and are outstanding achievements of ancient engineering and architecture. The Egyptians began building pyramids during the Third Dynasty of the Old Kingdom, evolving from earlier step pyramids to the smooth-sided structures we recognize today. This construction reflects their beliefs in the afterlife and the significance they placed on burial practices for their leaders. The architectural practices and labor organization involved in pyramid construction also exemplify the Egyptians' advanced understanding of mathematics and their ability to mobilize and sustain a large workforce.