The discovery of the third underground city of Hamedan province, which is about 2 km south of Salehabad, is a new incident in the field of cultural heritage of Hamadan and Iran, which once again brought archaeologists to work.
The underground city of Saleh Abad, located 2 km south of Saleh Abad, dates back to the Seljuk and Ilkhan era (the 6th and 7th centuries solar hijri calendar) with the extent of more than 5 hectares. The accurate size isn’t discovered yet.
In the first phase of the exploration, 6 spaces and several corridors were identified that each has a vent to the ground. The entry of agricultural soil through these vents has made the excavation so difficult.