Ancient civilizations

[Brian37]

I've seen video of people moving multi-ton stone blocks with neolithic tools. It can be done. Similarly, students at Indiana University laid three courses of stones the same dimension as those used in the Great Pyramid. They did so using people power only, no modern techniques or tricks. If a bunch of frat boys can do this we don't need alien help.

The only problem with the Giza Pyramids is that no one has figured out what kind of ramp they used.  A single ramp would have used more material than the pyramid itself and a ramp which wraps around the edges would have obscured the corners making it impossible for the architects to get accurate measurements.
I have a suspicion but no one is going to take a pyramid apart to test it out!

Actually today's physicists have a damned good idea how it could have been done.

http://www.livescience.com/45285-how-egy...tones.html