And don't say aliens dammit. I put this up here and not in the psuedo section for a reason. Is anyone here a stone mason or anything that may be able to shed some practical light on how they could have done it back then? If your not familliar here is the wiki: http://en.wikipedia.org/wiki/Pumapunku See those little groves and little holes in the groves on the right hand side near the edge of the block in the first pic on the right, or the long straight grove on the left hand side of the block on the first pic on the left? That's really what my question is referring too. The article makes no real guesses as to how this stuff was done. The blocks being the same size, shape, and straight edged could be done with lots of time and slow paced grinding, but I cannot think of anyway way besides some kind of drill to make the groves or the holes in the groves that straight and with such a sharp edge(though I have heard that the pictures make the edges look a little nicer then they are if you look at them up close).