Workers work at a site where a new collection of tombs has been found next to the biggest pyramid of Khufu, January 11, 2010. New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, as widely believed, Egypt's chief archaeologist heading the Egyptian excavation team, Zahi Hawass, said on Sunday. REUTERS/Tarek Mostafa (EGYPT - Tags: SOCIETY)