Castle and Fortress
The first sections of the castle is assumed to have been built by the Hurris.
In 349 during the reign of Roman Emperor Constantinus II, walls were built round
the city, and the Fortress was reinforced. It is made of basalte stones cut
out. During the Artuklu, Akkoyunlu, Selçuk, Ottoman and Republican eras it was
restored many times. It consist of two sections, the outer fortress and the
inner castle. The outer fortress walls contain 82 bastions and are 5 km long
and have four gates. The inner castle also has four gates and was surrounded
by walls during the period of Sultan Süleyman the Great.