Gökgöl Cave
Gökgöl Cave (Gökgöl Mağarası) is located at the Zonguldak entrance of the Zonguldak-Ankara highway, on the right side of the road. The cave features travertines, stalactites, and stalagmites. The first 875 meters of Gökgöl Cave can be visited. This illuminated has a walking path, bridges and viewing terraces.