Nan Madol-with 1000s of Micronesia islands, the ancients built 98 artificial islands of 250,000,000 basalt columns.https://www.quora.com/What-is-the-most-amazing-ancient-man-made-island-The-examples-would-be-at-the-minimum-over-1000-years-old/answer/Brian-Roemmele?share=87446fe0 …
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