3 ms·a book about this very topic: http://www.rachelsussman.com/oltw/ http://www.rachelsussman.com/oltw/by fs111 9y agoa book about this very topic: http://www.rachelsussman.com/oltw/ http://www.rachelsussman.com/oltw/jlewallen 9y agoAbsolutely fantastic book. I was surprised to learn there were a few examples closer to me that I had expected. Of course, their precise locations are usually obscured.kulu2002 9y agoFabulous... imagine if they were living and were able to talk about the eons they witnessed!