What exactly is the Osówka Underground City and who built it?

Osówka is a massive underground complex built in 1943 as part of Hitler's 'Riese' project, which was intended to be the largest Nazi headquarters in the entire Reich. The fortifications were constructed by workers and prisoners from the Gross-Rosen concentration camp in the Owl Mountains of Lower Silesia.

How much of the Osówka complex can visitors actually explore?

Visitors can explore approximately 1700 meters of underground corridors and halls that tell stories of the complex's past. The site features two prominent above-ground structures called 'Casino' and 'Gymnasium,' which served as external infrastructure supporting the underground facilities.

When did Osówka open to the public and is it worth visiting?

The underground tourist route has been open to the public since 1996 and is considered the most interesting and advanced construction complex built in the Owl Mountains. The site offers a fascinating historical experience through its concrete corridors and fortified halls filled with WWII-era stories.

What are the 'Casino' and 'Gymnasium' buildings at Osówka?

'Casino' is a monolithic single-story reinforced concrete structure extending about 50 meters in length, while 'Gymnasium' is a reinforced concrete foundation designed to house technical premises that provided services to the underground complex. Both structures represent significant engineering achievements of the Nazi construction project.

Where is Osówka located and what makes it architecturally significant?

Osówka is located in the Owl Mountains (Góry Sowie) in Lower Silesia and represents the most advanced construction facility in the region. The complex showcases massive concrete engineering and fortification design from 1943, making it a remarkable historical and architectural site for visitors interested in WWII-era structures.

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Historical Sites 📍 Sierpnica, Poland 122 views

Osówka Underground City

Photo · Raika K.

Osówka Underground City — Sierpnica, Poland.

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Sierpnica

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Historical Sites

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About Osówka Underground City

Osówka Underground City - Sierpnica | Secret World Trip Planner

The underground tourist route in Osówka complex is a system of concrete corridors, halls of fortifications that were built on a large scale in 1943, by workers and prisoners from the camp Gross-Rosen. Excavations are part of "Riese" complex - Hitler's biggest quarters not only in Lower Silesia, but in the whole Reich. Osówka Complex is the most advanced facility in terms of construction project in the Owl Mountains (Gory Sowie). The overground part of the complex is the external infrastructure of the underground premises. The largest two objects which attract the most attention are conventionally called "Casino" and "Gymnasium". "Casino" is a monolithic single-storey, reinforced concrete structure with a length of about 50 m and the second object, "Gimnasium" is a reinforced concrete foundation of technical premises designed to provide services to the underground part. Today you can visit about 1700 m of underground corridors and halls, full of stories of the past years. It is the most interesting complex built in the Owl mountains (Gory Sowie). Since 1996, it has been open to the public.