The Central European Republic of Poland boasts diverse geographical territories and cultural tribes that span thousands of years. Its cities and towns reflect a whole spectrum of styles, from Romanesque architecture to Gothic Revival and postmodernist residential and commercial structures. In addition to its unique topography and rich urban fabric, the country houses 17 UNESCO World Heritage Sites. One site, however, has stood out from the rest and given the country a royal status. Tucked beneath the Malinowka stream, just outside the southern city of Krakow, is one of the world’s oldest and largest hand-chiseled underground mines that has been transformed into an expansive, all-inclusive complex. From a naturally-healing health center to a secluded church and an underground bungee jumping platform, this colossal adaptive reuse project is the Wieliczka Salt Mine.