As a UNESCO World Heritage Site, Idrija boasts the second largest mercury mine in the world. It is also the birthplace of a distinct lace-making tradition, a specific culinary legacy and unique technical heritage. Discover "klavže" – water barriers that are the Slovenian equivalent of the pyramids in terms of their ingenious design. Set out to visit the UNESCO Geopark. With more than 140 years of history, the Idrija Lace School is the oldest school for lace in continuous operation in the world.