Currently, there are four sites in Slovenia inscribed on the list and five sites on the tentative list. The first site in Slovenia to be added to the list was the Škocjan Caves, inscribed at the 10th UNESCO session in 1986. In the 2010s, three more sites were inscribed, all of them transnational entries: pile dwellings at Ig, part of the Prehistoric pile dwellings around the Alps transnational site, in 2011, Idrija, as part of the transnational site Heritage of Mercury. Almadén and Idrija, in 2012, and two forest reserves, the Krokar and Snežnik-Ždrocle Virgin Forests in 2017, as a part of the extension to the site of Primeval Beech Forests of the Carpathians and the Ancient Beech Forests of Germany. Of these four sites, Škocjan Caves and the Primeval Beech Forests are natural sites while the other two are cultural sites, as determined by the organization's selection criteria.