1,300-year-old fortress-like structure on Siberian lake continues to mystify experts
riseearth.com/2016/02/1300-year-old-fortress-...
riseearth.comPosted Feb 21, 2016, 9:50 PM UTC
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riseearth.comriseearth.comPosted Feb 21, 2016, 9:50 PM UTC