The location of old Istanbul is marked in a triangular shape by the 6½ km-long city wall, called Theodosius II city walls, which started construction in 413. An earthquake in 447 almost destroyed them, so were rebuilt in a hasty two months
Location : Surrounding old Istanbul
Rumeli Hisari
Located within borders of Sariyer district and gave its name to the location, covering 30.000 m2 area. There is a monument-art built in the narrowest and flowing(600m) section of the Istanbul Bosphoreus just opposite Anadoluhisari.
Location : Rumelihisari
Anadolu Hisari
The castle covering seven acre area and giving its name to the location was built by Sultan Beyazid I (Yildirim) as the front military station of Ottoman in 1395
Location : Anadoluhisari
Yedikule Hisari
Yedikule hisari or shortly Yedikule, being one of important architectural arts of Istanbul is on the south of city land water and under authority of Directorate of Hisarlar Museum in the same town
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