Using Physics to Build Large Monuments

Presenting Wallace T. Wallington, retired carpenter and construction worker and his demonstrations of how the Egyptians, Picts, Britons and others may have moved extremely heavy rocks, stones, and blocks of such materials to erect and construct menhirs, obelisks, pyramids, Stonehenge, Easter Island, and similar sites.

And it doesn't require a huge work crew - just a bit of ingenuity.

There is a video here. and...
also one available on Wallington's website.