I know there are even bigger wheel coins made of stone in history - the Rai stones of Micronesia. The great mines of Falun in Sweden provided much of Europe's copper during the seventeenth century. Now a world heritage site the mine's production affected the economic and political situation throughout the continent and gave rise to one of the more idiosyncratic monetary practices. The countries vast copper resources swelled the royal coffers and in turn contributed to Sweden's significant politi