The Great Pyramids of Giza are among the most amazing man-made monuments in history. They were built when Egypt was one of the world's wealthiest and most influential civilizations. The king, or Pharaoh, occupied a unique role in ancient Egyptian civilization, as reflected by their enormous scale. Although the construction of pyramids peaked in the late third dynasty and lasted until about the sixth century B.C., they were actually constructed from the beginning of the Old Kingdom until the end of the Ptolemaic period in the fourth century B.C. (c. 2325 B.C.). The Egyptian pyramids, which still transmit much of their grandeur after more than 4,000 years, offer a window into the nation's illustrious past. Watch the video to find out more about the construction of the Pyramids!