To Free Being Me - much earlier in this thread I was arguing to possibility of an earlier, advanced society and posted some pictures of stone cutting and the obsidian spools by way of example. You made some really valid points, which I appreciate. If you have some time - take a look at this video. It is of the Serapeum at Saqqara in Egypt. It has some truly astounding footage of the place. For instance look at 4:18 There are some stone boxes that weigh some 50 thousand kilos or so - how did they move them in these tunnels?
Interestingly, most of these boxes are made of rose granite, an extremely hard rock mined at a quarry located about 800 kilometers from Saqqara while other boxes were made from an even harder material, diorite, found even further away from Saqqara.
The precision of the boxes is another characteristics that has left researchers or anyone who visits the place, baffled, with deviations registering in the thousandths of an inch. Extreme precision… thousands of years ago, the question remains: How is this possible? What are we missing here?