stone mysteries

Input seekers,

While we're talking about the Olmecs, why did they carve those gigantic heads? Why did they bring the huge stones from so far away?

It reminds me of Stonehenge, of course, which I visited in the 1970's. Back then we could still walk among the stones and we left our daughter in her stroller in the shade of one of the stones while we took pictures. You can't do that now, I guess.

Where did those early peoples get the huge stones for that monument? clock? calendar? astronomical observatory? Why? How did they know to line them up so perfectly? How did they stand them up and bury so much of the stones in the ground?

There are many stone mysteries in the world -- pyramids, Easter Island faces, Costa Rican stone spheres. Any answers to these enigmas?

DataLight