Mahdishahr Darband Cave is one of the largest caves of Semnan province located 3 km. south of Shahmirzad, overlooking the green valley. The entrance of this cave in the mountains is placed at an altitude of 1.35 m. and its width is 2.75 m. On entering, is a passage with a length of 24 m and a width of 3 m. The interior space being oval in shape measuring ...