Archeological Museum and Reserve Krzemionki (Polish: Krzemionki Opatowskie) is located eight kilometers north-east of Ostrowiec Świętokrzyski, between the villages of Sudół and Magonie. Krzemionki Opatowskie is a Neolithic and early Bronze Age complex of flint mines for the extraction of Upper Jurassic (Oxfordian) banded flints. There area contains about four thousand mines. In prehistory, flint, used for making smoothed axe blades, was excavated here. The tourist route in Krzemionki is approx. 1.5 km long and presents the original excavations of Neolithic mines, mining heaps and shaft pits that make up the unique industrial landscape from 5,000 years ago. The underground route is almost 500 m long and reaches 11.5 m in its deepest place. It allows visitors to see the well-preserved workings of prehistoric striped flint mines, as well as learn about the geology of the region. On July 6, 2019, the Krzemionki Prehistoric Striped Flint Mining Mining Region was entered on the UNESCO World Heritage List.