Erzurum Castle consists of the inner castle, where the guard soldiers are located, and the outer castle, which includes the streets, streets and neighborhoods where the people reside. There is a brick bath and rooms in the courtyard of the inner castle. During the Ottoman Empire period, the İçkale Masjid was built adjacent to the northern wall of the inner castle. Kırklar Tomb, Ebu İshak-ı Kâzerûnî Tomb and Ali Ağa Fountain have also been added to these structures.
Today, the walls of the outer castle have been largely destroyed and only the names of the gates opening to four directions are known. These are the Tabriz Gate, the Erzincan Gate, the Georgian Gate, and the Istanbul Gate, which was opened later, and the New Gate.
The castle, which was repaired in various periods, was lastly built in the 16th century by Suleiman the Magnificent and in the 19th century by II. It was repaired twice by Mahmut.