I've heard those theories as well, I like to think it was a global race of very technologically sophisticated ancient men, but who knows. I'm more interested in what can be said about the functional layouts of these sites or what the runes depict, because that's where we can actually make some good guesses based on the evidence that remains, whereas the people themselves are long gone. But I'm interested in anything to do with these ancient monolithic sites, even the far-out theories are enjoyable at least to entertain.