There are many theories about who build it. It is even more questioning when you are there because it was all recovered with carvings. In terms of building time we are looking at a few centuries and not 20-30 years of the official story. They must have some kind of advanced tools or technics to do it. Many theories are speaking of non-human also some of the carvings are just way too strange. Difficult to say for sure, but many strange things left without answers.
Regards.
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