The Smocza Jama cave is located within the small Wawel horst. It is unique on a national scale, as it has been formed due to the circulation of waters with the higher temperature. The total length of its corridors is 271 m, of which 81 metres are available to visitors. The entrance to the cave is located in the area of the fortified tower, the exit – at the Wisła boulevard below the buildings of the Royal Castle. It is guarded by the statue of the Wawel Dragon breathing fire.