Slovenia - Škocjan Caves

"This exceptional system of limestone caves comprises collapsed dolines, some 6 km of underground passages with a total depth of more than 200 m, many waterfalls and one of the largest known underground chambers. The site, located in the Kras region (literally meaning Karst), is one of the most famous in the world for the study of karstic phenomena." 

Source: UNESCO World Heritage

Slovenia - Spain - Heritage of Mercury Almadén and Idrija

"The property includes the mining sites of Almadén, where mercury (quicksilver) has been extracted since Antiquity, and Idrija, where mercury was first found in 1490 A.D. The Spanish property includes buildings relating to its mining history, including Retamar Castle, religious buildings and traditional dwellings. The site in Idrija notably features mercury stores and infrastructure, as well as miners’ living quarters, and a miners’ theatre. The sites bear testimony to the intercontinental trade in mercury which generated important exchanges between Europe and America over the centuries. The two sites represent the two largest mercury mines in the world and were operational until recent times." 

Source: UNESCO World Heritage

Austria , France , Germany , Italy , Slovenia , Switzerland - Prehistoric Pile dwellings around the Alps

"This serial property of 111 small individual sites encompasses the remains of prehistoric pile-dwelling (or stilt house) settlements in and around the Alps built from around 5000 to 500 B.C. on the edges of lakes, rivers or wetlands. Excavations, only conducted in some of the sites, have yielded evidence that provides insight into life in prehistoric times during the Neolithic and Bronze Age in Alpine Europe and the way communities interacted with their environment. Fifty-six of the sites are located in Switzerland. The settlements are a unique group of exceptionally well-preserved and culturally rich archaeological sites, which constitute one of the most important sources for the study of early agrarian societies in the region."
Source: UNESCO World Heritage