|| The Baradla Show Cave in the Aggtelek National Park , Hungary . The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst . The cave is one of the major attractions of Hungary with about 200 . 000 visitors per year . At least parts of the caves have formed in the cretacious period with periods of sedimentation afterwords . The fossilized cave has been reactivated in younger geological periods , making it quite unique . The northern hungarian mountains are part of the western carpathian moutains . It is a hilly forested landscape intersected by deep and steep valleys . The geomorphological features are dominated by the typical karst landforms , especially sinkholes . Below the surface many caves have formed with the Baradla Show Cave being the most famous . Europe , East europe , Hungary , Aggtelek , February 2011 ?