The Bridge of Justinian is a late Roman bridge that was built to improve communications between the capital Constantinople and the eastern provinces of the empire. The stone bridge rests on seven main arches. It has a length of 350m. It used to span the Sangarius river, which since has changed its course.
Full screen map of The Bridge of Justinian (On tentative list - Turkiye)
Can't recommend this for even a stopover, although I can't say if this site ever opens for a better look. It seems to be closed off entirely, with just glances possible from the distance, and just covered up with a roof. So while it may be a great example of late Roman architectural-engineering I can't tell at all, and it doesn't seem to be in good shape to show that off anyway.
