On vacation in Hawaii and here's a cool one.
The first one here is the Alekoko Fishpond, sometimes called the Menehune Fishpond. It's a very ancient aquaculture and even surviving Oral Tradition the native Hawaiians don't claim to have built it. They attribute it to Hawaiian leprechauns basically. Hawaii has an interesting history. It was subject to colonization by Polynesian and Tahitians over time. Which became what we consider native Hawaiians today.
In their oral stories they claim to have come and killed off the Menehune original inhabitants. Which are called diminutive and weak people. But also fine craftsmen. Some consider this just to be a to the victor go the spoils kind of thing. Those enemies were weak and small and we killed them!
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The second one here is an irrigation ditch made used... dressed stone. Native Hawaiians built tons of these. However, they never, not a single time, used dressed fine cut stone to do so. Ever. We know this because we have hundreds of examples of known Hawaiian construction before Western contact.
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So the question comes again. Who exactly had this level of engineering skill in ancient pre history long before the Polynesian barbarians came and killed them off? Afterwards a significant drop in technological level is present in the anthropological record. Which as you can see still exists today.