Matthys Levy

Once upon a time, seven wonders of the world stood tall and brilliant and, it must have seemed, would stand forever, impervious to time and gravity. Now only one remains--the pyramid at Khufu, in the Egyptian desert near Cairo. All of the others have fallen down. Modern technologies, computerized designs, and new materials have minimized structural failures nearly to the vanishing point. Even so, we can learn from ancient as well as recent history....