This underground complex was built under the Projekt Riese by Nazi Germany between 1943 and 1945. There were in total 7 different underground complexes constructed within the Owl Mountains (Góry Sowie) to shelter military facilities. The underground complex "Rzeczka" (2,500 sqm) is located within the Ostra mountain. There are 3 entrances.
"Rzeczka" is currently open to the public.
For current visiting hours, please visit the website of the museum.
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