I also thought the same, but apparently there are many things that we did not know in the past. For example, I recently learned that there are some temples made of dried mud that looks like a large carved rock. It seems we have a lot to learn from our ancestors about design and architecture :D
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Exactly @aswita. There are still multitudes of mysteries shrouding our ancient architecture. As you mentioned, even their primitive building materials continue to astonish us, seemingly defying the laws of nature by playing tricks on our senses and perceptions. 😊