Policemen are silhouetted against the Great Pyramid in Giza, Egypt, in 2012. Hassan Ammar/APEgypt unveiled the discovery of long corridor inside the Great Pyramid of Giza on Thursday, the first to be found on the structure's north side. The pyramid about 11 miles from Cairo's center is also known as Khufu's Pyramid for its builder, a 4th Dynasty pharaoh who reigned from 2509 to 2483 B