Human skulls are pictured in a mass grave of about 100 soldiers killed during a battle between Swedish and imperial Saxon troops during the Thirty Years' War on October 5th, 1636, near the village of Scharfenberg, about 100 kilometres (62 miles) north of Berlin July 24, 2007. The Thirty Years War was a series of wars in central Europe lasting from 1618 to 1648, principally on the territory of today's Germany, and involved most of the major European continental powers. [Reuters]

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