One of the largest caves in the Jura Upland at 306 metres long, this geological treasure is located about 12.5km from Ojców in the Będkowska Valley, and surely makes a great late-night secret headquarters when Bruce Wayne is in town charming the local ladies by day. The caves were discovered in 1841, and back in those days they were apparently brimming with bats. Open to the public only since 1994, the number of winged mammals inside has steeply declined, but that doesn't dent the historical, archaeological and geological interest of this attraction. Research carried out in the 1950's found traces of human life dating back 40,000 years, as well as the remains of some 4,000 cave bears; visitors will see the fossils of extinct beasts exposed in the rock walls of the cave, as well as literal piles of hundreds of bones on the floor of the cave, plus plenty of tiny bats hanging like little teabags from the roof of the cave. Fully electrified, the cave can only be visited with a guide, during which you'll explore about two-thirds (some 200 metres) of the cave's length. Tours in Polish are offered at regular intervals (tour lasts about 30-45mins), but tours in English should be arranged at least one week in advance.