There are four World Heritage Sites in Slovenia, with five sites on a tentative list. The United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Sites are places of importance to cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972. Slovenia, following the declaration of independence from Yugoslavia on 25 June 1991, ratified the convention on 5 November 1992. The first site in Slovenia to be added to the list of World Heritage Sites was the Škocjan Caves (pictured), 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, 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. (Full list...)