The Duna-Ipoly National Park Directorate has carried out a major conservation and tourism development project in the Pilis Biosphere Reserve and the World Heritage nominee Buda Thermal Karst cave system. The project aimed to protect the area’s outstanding geological and zoological values—especially its bat species—and to strengthen the educational and tourism roles of the caves. One of the main components of the development was the modernization of lighting systems in two popular show caves in