Iraj Castle is located to the north-east of Varamin and near Ja'far Abad in north of Iran. This great brick fortress in 1280 of about 1440 meters. Nowadays main gate remains. Iraj Castle is one of the significant castle of adobe with a height of 50 feet, an area of 200 hectares and was constructed in 1200 in the 100 meters during the Sassanid Empire.
Findings suggest that the castle was built in the Sassanid era by people, who suddenly abandoned the structure and never returned,” said archeology team-director, Mohammad Reza Nemati.
A ditch was found around the castle along with six ceramic pieces bearing Pahlavi inscriptions, There is not enough evidence to determine whether the monument was used for military purposes.
Considered by many as the world's largest mud-brick fort, Iraj castle is located to the north of Varamin-Pishva road in Tehran Province.