Rashkan castle is a formerly castle in north of Rey, Iran. It located near Cheshmeh Ali, Shah-Abdol-Azim shrine and Fath Ali shah inscription (Cheshmeh-Ali). The castle was intended to hold Rey, Iran. Rashkan castle was erected with plaster of lime and ashes or sand with stones. It was built during the Parthian rule of Persia.
The name comes from Arsaces I of Parthia, the first king of the Parthians. Some war items have been found there, now housed in the National Museum of Iran.[1]