Stunning Natural Caves of Slovenia

Istria, a peninsula in the Adriatic Sea, is shared by Slovenia, Croatia and Italy.  Slovenian Istria is a beautiful region in the southwest of Slovenia.  It has medieval towns, seaside resorts, vineyard landscapes and olive farms.  The underground world of Slovenia is exceptionally beautiful, comprising a vast network of underground caves, tunnels and rivers.    The subterranean halls exhibit stunning cave formations, unique structures shaped by water erosion over millions of years.  The caves of Slovenia are unique natural landmarks.