Goa Jomblang cave is one of the tourism highlights of Yogyakarta. The cave is located in Gunung Kidul, an hour to 90 minutes drive from Yogyakarta. To reach enter Goa Jomblang you are lowered 60 meters over the edge of a cliff into the sinkhole. At the bottom of the sinkhole is a hidden forest from where you enter a system of caves. The highlight of the trip is Grubug Cave. There is a hole in the roof of the cave and every morning the light filters through like a natural spotlight (if the weather permits).