Flint tools and weapons are a common find for archaeologists, with many being left behind by prehistoric civilizations; however, in Spain, researchers have discovered a set of incredible weapons made of rock crystal.

Between 2007 and 2010, researchers from the University of Granada, the University of Seville and the Spanish Higher Research Council excavated the megalithic tomb of Montelirio Tholos in Southwestern Spain.

The massive burial site sits 143 feet long with eight different sectors and includes a 128-foot-long corridor leading to the main chamber that is more than 15 feet in diameter. Dating back to at least 3000 BCE, the remains of around 25 individuals were found during the excavation and analysis suggested that at least one male and several females amongst them died from ingesting poison. The remains of the women were found in one of the chambers, seated in a circular fashion and next to the bones of who seemed to be the chief.

Nearby there were 19 rock crystal arrowheads found together in a cluster which led researchers to suspect that they were a spiritual offering. It is believed that rock crystal during this time may have had symbolic significance and these prehistoric cultures would have used it for vitality, magic powers and connections with ancestors.

The rock crystal dagger sat on its own in a separate chamber with an ivory hilt and sheath, measuring nearly 8.5 meters long and looking similar in shape to other stone daggers of the period...