A complex of mysterious undergrounds from II World War hidden in Owl Mountains makes a stunning impression on every visitor. Project Riese (“Giant”) was a code name for the biggest mining and construction enterprise of Nazi Germany. Between 1943 and 1945 numerous halls and corridors were built inside the mountains and in the Ksiaz Castle undergrounds. To conduct the work on such a large scale prisoners of the concentration camps were assigned to forced labour. Many of them lost their lives there. The work had never been completed, nor the purpose of this extravagant construction has yet been determined. It is assumed that Ksiaz Castle was intended to become one of Hitler’s main headquarters while the tunnels in Owl Mountains were designed for factories of military production or research centre on new types of weapon. According to some, Germans might have stored goods and valuables stolen during the war there. A few kilometers of the tunnels are open for visitors. An hour and a half drive from Wroclaw will take you to the underground city of Gluszyca–Osowka, the longest and the most interesting complex of the ones made available for tourists. Considering low temperature and high humidity inside the object, it is highly recommended to wear warm clothes.
Duration: 4-5 hours
| Prices (Polish Zloty): | ||||||||||
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| Number of people: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Price per 1 person: | 980 | 525 | 375 | 300 | 270 | 250 | 220 | 190 | – | – |
| Type of car: |  Volkswagen Passat |
 Volkswagen Caravelle |
 Mercedes Sprinter |
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| Included: | Transportation as above, private driver/guide, entrance fee to Riese Complex, entrance fee to Ksiaz Castle, VAT. | |||||||||
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