Voćin, Italy
Rupnica is an outcrop of columnar-jointed rhyolite in Croatia. It lies in the southwest of Voćin. The site used to be a quarry but is now a natural heritage. On 14 October 1948 Rupnica was declared the first natural heritage site of Croatia.
Listen to the audio guide for Rupnica Free on WIP — starts by itself when you arrive, even with the screen off