Well, I've gotta give you credit. Reading up on these myths has given me something to do while dealing with a very mundane task very late at night.
http://en.wikipedia.org/wiki/Puma_Punku
Wikipedia, which actually does believe in citation, has some interesting facts:
1. Puma Punku doesn't "defy modern dating techniques." Earliest construction has been dated to sometime in the 5th century AD.
2. Contrary to the true believer talking in the program, the largest blocks at Puma Punku are actually made of sandstone.
3. You don't need diamonds to work diorite. Or if you do, it's not too much of an obstacle for ancient civilizations, since the Code of Hammurabi was inscribed on diorite nearly 3000 years ago: http://en.wikipedia.org/wiki/Code_of_Hammurabi
All the same, it's a damned remarkable feat of engineering. It just isn't as impossible as the History Channel wants you to believe it is. This is a case where one particular set of ruins is poorly understood, so various people feel free to fill in the gaps.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
