Riese is a name of a plan and an underground mine-constriction complex created during the WWII. It is located in Góry Sowie (Awl Mountains) and Książ Castle. The main aim of the project was creation of massive, underground, bombing-proof spaces for Hitler and the most important people in Nazi Germany and also a canter of armament industry. According to plans this underground city was supposed to host even 40 thousand people. Currently, we are aware of existence of 7 major complexes. 4 of them are available to tourists: Włodarz, Osówka, Rzeczka and Książ. The longest tourist rout can be found in Włodarz. The notion of the complex fascinates all people that enter it. There are still many theories and speculations about multitude of its purposes. These are definitely the most mysteries underground routs in the country.