Devil's Playground (Diable Boisko) is an extraordinary sandstone rock formation located in the forest near the village of Pławna, in the Ciężkowice municipality of the Lesser Poland Voivodeship. It is a unique natural rock arch in the Polish Rożnów Piedmont region, with no equivalent in the Beskid Mountains. It was formed within a layer of Ciężkowice sandstones, which are part of the Silesian Nappe.
It is believed that the formation might have once been part of a cave, and its current shape is the result of intense weathering processes that left only the arch standing, with a layer of sand beneath it. Culturally, the name "Devil's Playground" originates from local legends that tell of devils playing in the sand under the arch; according to tradition, the arch is considered a gateway to hell.
The site was designated as a natural monument in 2004, highlighting its geological, ecological, and cultural significance. It is also a popular hiking destination, featured on a trail that leads from Pławna through the PKP (Polish State Railways) station and the local school, up to a crossroads with the blue trail on the Styr upland. Devil's Playground attracts both nature enthusiasts and tourists looking for unique places with rich history and cultural background.