Maybe this is where my cynicism lets me down, because I thought I was pretending to do exactly what the pattern-finding bleevers do - start with a pattern. I might have been a bit harsh.
In some cases no doubt they do. But most of the time it's rather unlikely. Aside from implying much more active dishonesty on their part, rather than just run of the mill delusions, it just doesn't make sense a lot of the time. For example, those triangles drawn on Britain. If he'd started off with a pattern and tried to fit it to something, wouldn't it look a lot more impressive than that? We've already pointed out that it's not symmetrical at all, why would someone start out with such a random, arbitrary shape and then try to fit it on somewhere? Far more reasonable is to assume that he really did just draw lots of lines between places, and it is simply that the pattern he sees is either not there, not interesting, or generally both.
The other major similarity they share is that we really DON'T know who built them, how they did it, or for what reason, or even for certain when it happened. We have 'lost' our ancient history.
Except that this is clearly complete bollocks. In many cases we know exactly who they were built by and why, and we have some pretty good ideas about how. The Egyptian pyramids are the most obvious example. They were built by the Egyptians. We even know details of the people who ordered some of them be built, and who designed them. And they were built to put dead bodies inside, for some combination of religious beliefs of an afterlife and simply having your name remembered as the guy inside the really big pointy thing. For other pyramids we have more or less information. In the Americas, for instance, we mostly know which civilisations built them but often know less about exactly who was involved.
Proof as to what has happened is lacking...so far.
No, what you mean is that you don't care in the slightest about proof and prefer your nonsensical imaginations. I would normally put it down to simple ignorance, since many people just don't know that much about pyramids and such. However, in your case you've had these things explained to you many times before, so if it is ignorance, it's deliberate. Based on your posts, it seems far more likely that you're not ignorant, you simply don't care in the slightest about reality.
Moreover, to conclude that ancient people had no global contact/awareness of other cultures is not something I am willing to do just yet. I'm not sure one could ever conclude that. How do you present proof of a non-event?
This is where knowledge of the burden of proof can come in handy. In the absence of any evidence suggesting something happened, the default hypothesis is that it didn't. It lies upon those suggesting that it did happen to provide evidence of such. In the case of global communication many thousands of years ago, the only evidence appears to be that pyramids are pyramid-shaped. You'll have to do a lot better than that if you expect anyone to take your claims seriously.