The Ciemna Cave, also known as Ojcowska, is a fragment of an ancient system of chambers and passages totalling 230 metres. It is well worth a visit. The entrance chamber of the cave is the largest known cave hall in the Kraków-Częstochowa Upland. It is located in the Prądnik Valley, and the cave consists of the present-day cave proper, closed with an iron grate, a tunnel just to the right of it, and behind it is the so-called Garden – a kind of rock courtyard surrounded on three sides by rocks formed by the collapse of the cave ceiling, which passes into a tunnel called Oborzysko Wielkie. Ciemna Cave has poor flowstone decoration, as it was destroyed in the 19th century. It is among Poland's most valuable archaeological sites – the oldest traces of man in Poland have been found here, as well as the remains of a cave bear and wolverine. In front of the cave, visitors will find a platform and information boards. The encampment of Neanderthal man, for whom the Ciemna Cave was a refuge, has also been reconstructed. The interior of the cave is humid, with temperatures around seven degrees all year round. Of the fauna, in addition to wingless insects, moths and white whirlwinds can be found, and bats (usually great nightjars and small horseshoes) also overwinter here.