 Well, one thing is they didn't fall of their own natural accord, usually. They stayed up there. They were pretty well positioned. What happened in the late part of Egyptian civilization, they were invaded by the Persians, and there was a Persian king named Cambyses who pulled down many of the obelisks. We know that. Also later, still later in their history, they were taken over by the Romans, and the Romans took them down and brought them back to Rome as war trophies. And to this day,