Riese (German for "giant") is the code name for a construction project of Nazi Germany in 1943–1945, consisting of seven underground structures located in the Owl Mountains and Książ Castle in Lower Silesia, previously Germany, now a territory of Poland. None of them were finished; all are in different states of completion with only a small percentage of tunnels reinforced by concrete. The purpose of the project remains uncertain because of the lack of documentation. Some sources suggest that all the structures were part of the Führer Headquarters; according to others, it was a combination of headquarters (HQ) and arms industry but comparison to similar facilities can indicate that only the castle was adapted as an HQ and the tunnels in the Owl Mountains were planned as a network of underground factories. Source: Wikipedia

Projekt Riese (z niem. olbrzym) – kryptonim największego projektu górniczo-budowlanego nazistowskich Niemiec, rozpoczętego i niedokończonego w Górach Sowich oraz na zamku Książ i pod nim w latach 1943–1945. Przenaczenie nadal pozostaje nieznane. Mogła to być jedna z kwater głównych Adolfa Hitlera. Jednak porownujac z podobnymi obiektami sztolnie mogly byc podziemnymi fabrykami. Na projekt Riese przyznano w 1944 roku 28 tysięcy ton stali i cementu, czyli tyle, ile Niemcy przeznaczały rocznie na budowę schronów przeciwlotniczych dla ludności cywilnej. Zródlo: Wikipedia