Rud-khan castle (also Rood-khan castle), is a brick and stone medieval castle in Iran. Located 25 km southwest of Foman city north of Iran in Gilan province, it is a military complex which had been constructed during the Seljuk Dynasty by the followers of Ismā'īlī
sect. The Castle is built on two tips of a mount, with an area of
50,000 square metres. Its architects have benefited from natural
mountainous features in the construction of the fort.
A river known as 'Rudkhan Castle River' also exists near the castle,
which originates from the surrounding heights and flows from south to
north. After crossing a mountainous winding route with dense forests,
the first thing that one notices about the castle is its big entrance
gate. Rudkhan Castle sits at the two peaks of a mountain at elevations of
715 and 670 meters and contains strong fortifications and battlements at
a length of 1,550 meters. The castle's 42 towers still stand intact.