Dating from the late 3rd or early 4th century AD, Diocletian's camp comprises the remains of a monumental gateway, a tetrapylon and two temples, one of which, the Temple of the Standards, dominates from an elevated position at the head of a flight of worn steps. The 'camp' was erected after the destruction of the city by Aurelian.
The extent of the complex and the fact that it was built on top of, and incorporates, earlier structures of evident grandeur has led some historians to speculate that it occupies what had been the palace of Zenobia.Behind the complex a section of fortified wall climbs a steep hill - from where there are excellent views of the site - then descends, edging around the southern edge of the city.