The ancient civilization known for its impressive pyramids is the Ancient Egyptians. These monumental structures served as tombs for pharaohs and high-ranking officials, demonstrating the Egyptians' architectural prowess and their beliefs in the afterlife. The most famous pyramids, including the Great Pyramid of Giza, were constructed during the Old Kingdom (c. 2686–2181 BC) and reflect the Egyptians' advanced knowledge of mathematics and engineering. The pyramids symbolized the Pharaoh's power and were believed to facilitate their journey to the afterlife. The ingenuity behind these structures continues to be a subject of study and admiration in modern archaeology.