The only surviving wonder of the ancient world, Egypt's pyramid of Cheops takes up 13 acres of land, and overlooks the neighboring pyramids belonging to this pharaoh's son and grandson. Experts speculate it took one hundred thousand laborers roughly 20 years to build the pyramid of Cheops alone. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.