Pillkukayna is an archaeological site with the remnants of ancient constructions, located on the shore of the island of Isla del Sol in the southern part of Lake Titicaca in Bolivia. There is very little information about Pillkukayna and who built this structure. It requires more archaeological investigation and funding. For now I have documented this site and included images below and will update this post as soon as more information becomes available.
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Wikipedia: https://en.wikipedia.org/wiki/Pillkukayna