Castellum Pontes, next to the Trajan’s bridge, lies on a high bank of the Danube, opposite the Romanian Drobeta / Turnu Severin fortress. It was named after the Romanian fortress – Transdrobeta. Although it was reconstructed over the centuries, it retained its original shape, characteristic of the auxiliary Roman fortifications of the Trajan’s period. They were square fortresses with rounded corners and square towers on the inside of the stone walls, on corners and at the gates. The North Gate – porta praetoria and the South Gate – porta decumana, were placed in a central position of the rampart. The interior was also divided by an axis, according to the rules of the time, with the headquarters building – principium, in the centre of the intersection of the two main streets.
The north and east ramparts were discovered and conserved completely over the course of the previous works, as well as most parts of the west and south ramparts, all four gates, towers (16 out of 18?), parts of the headquarters building / principia, workshops, warehouses, and late Roman structures. After being considerably damaged during the 2nd century, all parts of the fortress were reconstructed during the Severus dynasty at the beginning of the 3rd century, as well as in the later periods. The fortress, like the Roman Empire and its frontiers in general, suffered great destructions in conflicts with the Goths and the Huns in the 4th and the 5th centuries AD.