Rudkhan Castle; also Roodkhan Castle, is a brick and stone medieval fortress in Iran that was built by the Gilakis to defend against the Arab invaders during the Arab/Islamic invasion of Sassanian Iran. With the fall of the Sassanid Empire, this area became a defensive position against the Arabs in the then-newly established Tabarestan.
Located 25 km southwest of Fuman city north of Iran in Gilan province, it is a military complex which had been constructed during the Sasanian era, and later rebuilt during the Seljuq era by the Nizari Ismailis. The castle is built on two tips of a mount, with an area of 2.6 hectares. Its architects have benefited from natural mountainous features in the construction of the fort.
Coordinates 37°3'51.263" N 49°14'21.812" E