A low archaeological mound 5 kilometres south-east of Damghan covering layers of settlement from the late 5th millennium BC through the Sasanian period. Tepe Hissar is one of the most important Bronze Age sites on the Iranian plateau — the trove of jewellery, ceramics and metalwork excavated in the 1930s is shared between the museums of Tehran, Philadelphia and Damghan itself.
Most of the finds have been removed but the trenches and the citadel walls are still visible. A small visitor centre at the entrance has photographs and copies of the excavation reports.