Not far from Zawiercie, in the area of the village of Piaseczno, Mother Nature modeled a group of the rocks known as Wielki Okiennik, roughly translated as “Large Window”. The name speaks for itself. In the mighty rock wall Mother Nature carved out a window of about 7 deep, and of which diameter is 5 meters. The Eagles’ Nests Trail runs at the foot of the rocks, so tourists know this place well. But the rocks are the most popular among climbers. They marked out a couple of difficult trails here. The trails have graceful names such as "Chimney of the Astronauts”, "Super Action" and "Pillar of Silesia."