The main pyramids of the Giza Necropolis (front to back): Pyramids of the Queens, Pyramid of Menkaure, Pyramid of Khafre, and Pyramid of Khufu. The pyramids are the sole remainders of the Seven Wonders of the Ancient World, and, along with the ancient city of Memphis and the pyramids of Dahshur, are listed as UNESCO World Heritage Sites.Photo credit: Ricardo Liberato