Throughout history, archaeologists have uncovered countless tools from early civilizations. The majority are made of stone, but a group of Spanish experts discovered incredible rock crystal weaponry. One of the most spectacular crystal daggers, dating back to at least 3,000 BC, demonstrates the extraordinary ability of the sculptor.The incredible find occurred at the Montelirio tholos, a megalithic tomb in southern Spain. This gigantic site, which spans 50 meters, is made up of massive slate slabs. The place was excavated between 2007 and 2010. Scholars from the University of Granada, Seville, and the Spanish Higher Council for Scientific Research published a...