Karamagara Bridge built
600 CE.
Shown on the map at 38.925°, 38.658°.
The Karamagara Bridge (Turkish: Karamağara Köprüsü, "Bridge of the Black Cave") is a Byzantine or late Roman bridge in the ancient region of Cappadocia in eastern Turkey, and possibly the earliest known pointed arch bridge. The bridge, along with much of the Arapgir Çayı valley, has been submerged since the completion of the Keban Dam in 1975, as a result of which the water level in the Euphrates valley and some of its upstream tributaries dramatically rose.
Text from the Wikipedia article Karamagara Bridge, licensed CC BY-SA 4.0.