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Depending which guide book you look this up in, it's either the "Rumeli Fortress" (Rick Steve's) or the "Fortress of Europe" (Eyewitness).

Image 20100322.2830.GO.CanonSX10.web.jpg, size 227127 b
Image #20100322.2830.GO.CanonSX10
Photo © 2010, Giles Orr

https://gilesorr.com/travels/Istanbul2010/images/Istanbul2.20100322.2830.GO.CanonSX10.html 
by giles