Ancient Nan Madol is 98 manmade islands w/ >250,000,000 magnetic Prismatic Basalt columns. http://qr.ae/RwOiqI pic.twitter.com/TcRwuKIFQT
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@jpnKevin_T Kevin, great insights! Turns out the site aged correct is perhaps 15,000 years old. And may not have been an island when built.