Ojcow National Park is one of the most interesting national parks in Poland near Krakow, created in 1956. In spite of the fact that it is the smallest national park, it is very interesting. The main attraction is its limestone karst forms - rocks and caves created naturally through the activity of water in carbonate and limestone rocks (see a famous Hercules cudgel below) . The presence of the limestone rock in this region who was strategically very important for Poles allowed building beautiful castles and fortecess. Some of them are still in good shape (see Pieskowa Skala), some are in ruins.