The strategic position including the abundant natural resources were favorable for the development of human settlements in Kosovo, as is highlighted by the hundreds of archaeological sites identified throughout its territory. The first archaeological expedition in Kosovo was organized by the Austro-Hungarian army during the World War I in the Illyrian tumuli burial grounds of Nepërbishti within the district of Prizren. Since 2000, the increase in archaeological expeditions has revealed many, previously unknown sites. The earliest documented traces in Kosovo are associated to the Stone Age, namely there are indications that cave dwellings might have existed, as for instance the Radivojce Cav close the spring of the Drin River, then there are some indications at Grnčar Cave in the municipality of Vitina and the Dema and Karamakaz Caves in municipality of Peja and others.