Quite interesting - Mayan day/nights and earth periods

[Confused]

underground cities are a curious case. what was the reason they were built ?

to keep a portion of south american population continue the work they are doing, at the wake of the future invasion and conquest by spanish or others ?

to be a place for the soon-to-start 4d civilization to live while the 3d population fades out ?

to be a place for the harvested and dual activated to live out their life and start the 4d society when the surface gets uninhabitable ?

I just searched on those terms and found this random page --

Ancient cities under the sands of Giza

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I think that universe is a very personal place.

Your presence makes me think so too many times, despite my deep seated cynicism and skepticism.