Has Wally really figured out how ancient wonders such as Stonehenge and the Great Pyramids were built? It seems to good to be true, but after watching the video and reading his site, you can easily imagine ancient construction teams using the same methods demonstrated here.
If you had to choose between aliens or some forgotten technology, maybe Occam's Razor does kick in. I know I was left wondering why I haven't seen Wally on the Discovery channel, or the History channel?
Of course, it all looks like black magic, or alien technology, if you only have a rudimentary idea (at best) about some of the forces at work.