The most magnificent is
Göbekli Tepe in Turkey. Not because of what they built, but because of when it was built. 11000 years ago, so in Neolithic and all was built with stone tools. Worth for everyone to google it and check.
Like.
This is a perfect example of preserved ancient megaliths, intentionally buried - to preserve.
Nikola Tesla was right all the time.
Of course he was.
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Okay, I'm done, sorry.