Lost Temples: Mystery of the Akapana Pyramid by shift · 2010/09/12 Scientists decode the life giving riddle of Bolivia’s great Akapana Pyramid. (2:39 min)
interesting tidbit… so much info packed into 2:39!
Yes, thank you for pointing that out. This is quite a little nugget. First I have never heard of an ancient civilization in Boliva… brilliant enough to figure out such a sophisticated solar collector/irrigation/farming system.