Hidden beneath the slopes of Mount Włodarz in Poland's Owl Mountains lies one of the most mysterious places in Central Europe — a vast, unfinished underground complex carved out by Nazi Germany between 1943 and 1945. With over 3,200 metres of right-angle corridors, a massive unfinished hall and the weight of a deeply tragic history, this is a place that will stay with you long after you leave.

Włodarz is the largest of the individual Riese project sites. Walking through the concrete-reinforced tunnels, you feel the cold of the rock and grasp the sheer scale of what was built here — 42,000 m³ of excavated space, four entrances, a grid of intersecting passages and flooded sections still off-limits to visitors. The atmosphere is sombre and contemplative year-round; inside, the temperature and dim light never change, regardless of the season above ground.

How to get there

• Parking at the Włodarz site near Głuszyca — direct access to the tourist route, moderate difficulty, guided tour approx. 1–1.5 hours
• Reachable by car from Głuszyca or Walim via well-signposted local roads

Practical information

• The complex is open for guided tours only
• Temperature inside is consistently low — bring a warm layer even in summer
• Approximately one-eighth of the tunnels remain flooded and inaccessible
• Nearby attractions include the Osówka complex and the Walim Tunnels Museum in Rzeczka

Historians still debate the true purpose of the tunnels — Hitler's headquarters, a shelter for 40,000 soldiers, or perhaps secret weapons laboratories? According to some accounts, thousands of prisoners were killed here in spring 1945 to ensure the secret of the construction would never be told.