Arg-e Ali-Shah, also known as Arg-e Tabriz, is a remnant of a fortress built in the Ilkhanate period. Currently it is placed in the center of Tabriz, in Iran.
Historians believe it was used as a military castle. However, clerics claim that the structure was initially used as a mosque, but during the Qajar era was used as a military post and storage facility for weapons (in Persian 'Arg' means 'castle'). Consequently, after the Iranian Revolution clerics damaged large parts of the Arg to make a new mosque. The structure today stands 28 meters high, and is still used as part of a space for holding friday prayers in Tabriz.
The Arg is located in Imam Ave, behind Taleqani Street, Tabriz.
[[:Category:Castles in Iran|List of Iranian castles]]