The area around Krupka (Graupen) has been profoundly shaped by tin ore mining over a period of at least 800 years. Streaming was probably used to extract tin here from as early as the Bronze Age. From the 13th century at the latest, tin ore was mined, but copper and later tungsten, bismuth and molybdenum ores were also extracted, along with common feldspar and fluorite. As the oldest tin district in the Erzgebirge, Krupka has greatly influenced the science of mining tin deposits. This knowledge was applied in Krupka and in other districts on both the Bohemian and the Saxon sides of the mountains.
The Starý Martin adit is a first-class mining monument that has the longest tin lode in central Europe with a strike of 2 km. Many further important remains of above-ground and below-ground mining from the 13th to the 20th century can be found in the mining districts Knötel, Preisselberg and Komáří hůrka (Mückenberg). The growth of the mining town Krupka is closely connected to mining. Particularly striking is Krupka Castle, a 14th-century building. Other buildings of great importance are the Gothic Church of the Assumption of Mary with its late Gothic bell tower, the Church of the Holy Spirit, the Church of St. Anna, preserved in the Renaissance style, and historical town houses.