This Byzantine aqueduct, about seven kilometers north of Safranbolu, sits high above the Tokatli Gorge.

 Unfortunately, due to safety considerations, you're no longer allowed to walk across the aqueduct itself, but you can get great photos of it from the entry point into the gorge. 

When you've finished with your snaps, take the walkway down into the gorge for an easy two-kilometer walk amid the lush canyon scenery.