Darband Cave is one of the greatest limestone caves in Iran that is located 2 kilometers from the north of Darband Tourist Area in Mahdishahr, the center of Mahdishahr County in Semnan Province. Mahdishahr Darband Cave is a tourist attraction from cretaceous period of the tertiary geological era III and one of the limestone caves with a pile of white-grey pastules with a generally oval shape. Darband Cave is one of the greatest limestone caves in Iran that was human habitat in the past. Mahdishahr Darband Cave with 140 million years of age is the second greatest limestone cave in Iran.
This cave was first investigated in 1325 by the Mountaineers Committee of Iran and a group of 4 mountaineers entered the cave in 1327 with the aim of discovering it and they were successful.
This cave is one of the visitable caves in Semnan Province for its enormous limestone columns and access survey.