Coordinates: 38°04′20.63″N 46°17′18.05″E / 38.0723972°N 46.2883472°E / 38.0723972; 46.2883472
Ark-e AliShāh, also known as Ark-e Tabriz and Masjid AliShāh, is a remnant of a mosque in the center of Tabriz, Iran, built in the Ilkhanate period.
According to some historians, it was used as a military castle however, others claim 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 'Ark' or 'Arg' means "castle"). Consequently, after the Iranian Revolution the regime of Islamic republic damaged large parts of the Ark 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.