1,300-year-old fortress

http://www.ancient-origins.net/news-history-archaeology/1300-year-old-fortress-structure-siberian-lake-013323

1,300-year-old fortress-like structure on Siberian lake continues to mystify experts

It is one of the most mysterious archaeological sites in Russia – an ancient complex engulfing a small island in the center of a remote lake in the mountains of southern Siberia. At first glance, it appears to be an ancient fortress, its perimeter of high walls constructed to keep out enemies. However, others have proposed the 1,300-year-old structure may have been a summer palace, monastery, memorial complex, ritual center, or astronomical observatory. According to the Siberian Times, more than a century after its rediscovery, experts are no closer to understanding the secrets of these enigmatic ruin

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