Kızkalesi (fortress) built
1104 CE.
Shown on the map at 36.457°, 34.148°.
Kızkalesi (from Turkish: "Maiden's Castle", also known as Deniz kalesi) is an island castle situated on a small island in Mersin Province of Turkey.
Text from the Wikipedia article Kızkalesi (castle), licensed CC BY-SA 4.0.