Before further information, I want to say right away that if it is difficult for us to believe in something, it does not mean that it could not be. That is, one should not immediately say that such a civilization could not exist. Now, to the facts.
I do not know if this can be called direct facts, but figures of various images of reptilians or reptilians have been found all over the world. This is either something that looks like snakes or crocodiles.
Surprisingly, archaeologists estimated some of these figurines as 15-17 thousand years old.
But the most interesting, as for me, is the well-known collection of creatures that resemble only one thing - snake-like creatures. They have a head like a snake, as well as attributes similar to the one that the Egyptian pharaohs had - a rod and similar headdresses (I do not know what they are called correctly).
In general, there are a lot of such figures. But the next one is also one of the most interesting. It is a crocodile-like creature on a flying saucer. An interesting figure precisely because of the "saucer", because it is a "centuries-old image" of alien flying vehicles.
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But there is more to say than a lot of figurines. I have already written two articles about structures where very small passages were found, 30-40 centimeters in size.
One of these is an underground structure in the North Caucasus, which, apparently, was not studied, or classified. But the second is the well-known pyramid of Cheops. Only in the pyramid, a 30-centimeter passage was examined by a robot and a door with handles was found there, that is, someone had to open and close it.
If the Reptilians really existed, then we can only guess what they were. However, from terrestrial creatures, for example, snakes, I can assume that they could be smaller than people and, accordingly, quite flexible and crawl.
In general, it is possible that such creatures could use these moves. If we do not know anything in the Caucasus, then in the pyramid it is a fact that there is a door in a small passage where a person will not get, even a child.
What conclusion can be drawn? Personally, my opinion is that if people depict something the same, being in different parts of the world, then they saw it. Many people may disagree with this, but I do not believe that in different parts of the Earth people had the same images and one fantasy.
Of course, what we have is not enough to somehow support this version, but then everyone decides for himself whether to believe or not. Of course, I am not sure of the existence of such a civilization, but this cannot be ruled out.