Apart from a number of good-size rooms, the possessor of this attractive residence had his own baths, in the hot room of which once stood the mosaic of Filadelfis (now on display in the museum. Back towards the museum, the trail, which was once the street to Constantine (then Cirta), continues to the town's north gateway. The original Roman town was designed as a great square, 355 metres long on each side, with this entrance set into the centre of its north wall. From here you will hit the cardo maximus, the central north-south avenue, a long straight stretch of chariot-rutted paving that runs uphill to the heart of town. Five metres wide and 180 metres long, it covered one of the most important drains and was, in its prime, bordered by colonnaded walkways or porticoes.

From the theatre it is worth walking across the pitted pathway and all the way through the scrub to the fortress. The Byzantines chose to construct outside the original settlement, on the location of a previous shrine to the guardian holiness of a water source. In contrast to the original site of Timgad, which was never walled, the fortress is a colossal military structure, 112 metres by 67 metres, its limestone walls 2.5 metres thick, secured by towers in each angle and at the gate.

Inside the fortress, officers were quartered on the right, around the basin connected with the water deity, and armed forces on the left. The ruins of barracks and many other rooms can be made out amongst the overgrowth. The land around the fortress, like much of Timgad, has yet to be completely excavated.