Pits, ditches, precipices, abysses, and caves can be found on the peripheral plateaus (Ponikve, Stapari) and the sides of the gorge. The largest cave in the gorge is Megara, still active and accessible. It is located in the Stapari part of the gorge, on the hill Gradina (near the settlement Popadici).
The entrance to the cave is located on the southern slopes of Gradina hill, 30 m from the bottom of the vertical section at an absolute height of 570 m (J. Petrovic, 1976). Megara Cave is a karst cave consisting of two passable channels: the main one which is dry (short, spacious, a winding channel that narrows from the entrance and ends blindly at the end), and the lower one which forks just before the exit. The total length of the Megara canal is 52 meters with weakly expressed cave jewelry. The cave has been a cult place since prehistoric times, where it is believed that there was a temple and altar of the Illyrian god Jupiter Partinski.
Although active and attractive, the Megara Cave is a site that is not arranged for tourist visits, but the tour is possible only in the presence of more experienced members of speleological or mountaineering societies.