Some natural geometric shapes: http://www.dailymail.co.uk/news/worldnews/article-1228844/These-stones-really-ARE-rolling-Mystery-Death-Valleys-eerie-moving-roc

Some natural geometric shapes: http://www.dailymail.co.uk/news/worldnews/article-1228844/These-stones-really-ARE-rolling-Mystery-Death-Valleys-eerie-moving-rocks.html http://www.dailymail.co.uk/news/worldnews/article-1228844/Th... http://www.ironammonite.com/2009/12/surviving-cueva-de-los-cristales-giant.html http://www.ironammonite.com/2009/12/surviving-cueva-de-los-c...