Pretty fascinating stuff. Definitely goes down as probable in my book. [ame=http://www.youtube.com/watch?v=lRRDzFROMx0]YouTube - Building Stonehenge - This Man can Move Anything[/ame]
Ancients didn't have technology that we have now-a-days. They had to apply basic principles of leverage and weight distribution to a massive scale. But they had time and man-power and determination. I don't like it when people simply say that it wasn't man that built it, but aliens (or rather with the help of aliens). It's perfectly plausible that man constructed such monuments, and this video just helps show that. Good find.