Arch of Galerius
The imposing kamára (arch) is one of a number of monuments built by Galerius around AD 305, during his reign as co-emperor of Diocletian's divided Roman Empire. It commemorated the Roman victory over Sassanid Persian Empire in AD 297, and you can still see scenes of those battles on the badly eroded bas-reliefs. Originally, the arch had four pediments and a dome and was intended to span not only the Via Egnatia, the ancient Roman road, but also a passageway leading north to the Rotunda. Only the large arches remain.