Banská Štiavnica (; , ) is a town in central
Slovakia, in the middle of an immense
caldera created by the collapse of an ancient volcano. For its size, the caldera is known as
Štiavnica Mountains. Banská Štiavnica has a population of more than 10,000. It is a completely preserved medieval town. Because of their historical value, the town and its surroundings were proclaimed by the
UNESCO to be a
World Heritage Site on December 11, 1993.