Scientists in Afganhistan have discovered a natural all stone arch spanning 200 feet. the natural wonder moved up to number 12 on the list of longest natural bridges. the bridge contains rock formed from the jurassic period and carved out by the once filled with water jawzri canyon.
http://esciencenews.com/articles/2011/03/30/newly.discovered.natural.arch.afghanistan.one.worlds.largest
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