The underground Mithraeum
A secret rock-cut temple of the Roman soldiers' cult, the only one known on Rome's eastern frontier, uncovered in 2016.
Chansey — CC BY-SA 4.0 · Zerzevan Kalesi — CC BY-SA 4.0 · Zerzevan Kalesi — CC BY-SA 4.0 · Chansey — CC BY-SA 4.0
Beneath this hilltop fortress is a secret temple with no known equal anywhere on Rome's eastern frontier: a sanctuary of Mithras, the shadowy soldiers' cult whose rites were held underground and closed to outsiders. It stayed buried for some fifteen centuries until excavators reached it in 2016, and it is the reason Zerzevan is more than another ruined garrison on a rocky rise between Diyarbakır and Mardin; the site joined UNESCO's tentative list in 2020. The fortress deserves the climb on its own terms. The Eastern Romans built it in the 4th century to watch the road between Amida (modern Diyarbakır) and Dara, Anastasius and then Justinian rebuilt it, and it served until the Muslim armies arrived around 639. What survives is roughly 1,200 metres of wall rising to 12 metres in places, a watchtower of more than 21 metres, a church, barracks, rock-cut cisterns and tombs. Digging has run every season since 2014 and still turns up new finds; restoration of the underground church and the Mithraeum is planned, so expect part of them to be fenced off. The view is half the visit: the Mardin plain runs away to the horizon and on clear days the Mesopotamian flatlands stretch towards Syria. But the hill is completely exposed, with no tree or shade anywhere, and July and August push well past 40°C; come early in the morning or towards sunset and carry water and hats. The paths are bare rock and uneven, so pushchairs are useless here and small children need a hand near the drops. Spring and autumn are the seasons that make sense. There is no public transport to the gate. From Mardin drive about 50 km along the D950 towards Diyarbakır; the castle stands beside the highway at Demirölçek village, 40 to 45 minutes away. The smart move is to make it a stop when travelling between Mardin and Diyarbakır if you are seeing both cities; otherwise take a taxi and agree on waiting time. Entry is currently free, the site is open daily in daylight hours, and an hour to an hour and a half is plenty.
A secret rock-cut temple of the Roman soldiers' cult, the only one known on Rome's eastern frontier, uncovered in 2016.
Some 1,200 metres of wall and a tower of more than 21 metres looking out over the Mardin plain to the horizon.
Church, barracks, rock-cut cisterns and tombs, with excavations adding to the picture every season since 2014.
Demirölçek village, D950 Diyarbakır–Mardin highway, Çınar, Diyarbakır
With a single day in Mardin, no; the old town and Deyrulzafaran come first. But if you are driving to or from Diyarbakır the castle sits right on your route, and an hour there is easily worth the stop, especially towards sunset.
The climb is short but the ground is bare, uneven rock and there is no shade at all. School-age children enjoy the walls and the underground temple; pushchairs are hopeless, and anyone unsteady on rough ground may prefer to stay at the visitor centre and the view from below. Avoid midday in summer.