*waves hands about and magically resurrects a very dead thread from the grave* (I even tagged it, too

)
A few quick links for background info:
www.crystalinks.com...
gosouthamerica.about.com...
en.wikipedia.org...
I just learned of the existence of Tiahuanaco (Tiwanaku) tonight, while watching a UFO documentary, strangely enough. The claim was that ancient
peoples could not have built the magnificent and massive structures seen at Tiahuanaco. The altitude is something like 12000 feet above sea level,
meaning that it would be difficult to live there, since crops wouldn't grow well in the area. Some of the blocks used in construction are heavier
than the blocks in the Egyptian pyramids; how did they get to that height? I personally have no idea how it was done.
I had never heard of Tiahuanaco, and I consider myself reasonably well informed in matters of history, so my guess is that it might be new to a bunch
of members here, too.
Does anyone know more about this? Are there some good books on the subject? I'd be interested in learning more about Tiahuanaco, if anyone has any
info...