One of the oldest arguments used by pyramidiots and other woo woo types to prove that the pyramids and other examples of massive stone architecture couldn't have been made by ancient peoples without futuristic technology is the sheer size of the stones used to build them. This is used to 'prove' that Atlanteans or space aliens must have been involved. This is rubbish, of course, and there have been many experiments conducted to show that the effort involved was not beyond the capabilities of early humans.
The above video is one more nail in the coffin. It shows one middle-aged Michigan man, Wally Wallington, moving huge stones by himself using techniques he developed. I was immediately reminded of Edward Leedskalnin, who over a period of 28 years built by himself a series of huge rock sculptures at his estate in Florida, called Coral Castle. As in the case of the pyramids, this feat has led some to claim that he had special technology or psychic abilities, since no one saw him construct the objects.
Contrary to the narrator in the clip, we can't know that the techniques used by Mr. Wallington were used to construct Stonehenge. It seems likely that a variety of approaches were used (note that one of his demonstrations requires a handy concrete slab under the block). Nevertheless, as an example of what can be achieved with human ingenuity, it is amazing.