About 13km to the southeast of Baris, Qasr Ad Dush is an imposing Roman temple-fortress completed around AD 177 on the site of the ancient town of Kysis. A 1st-century sandstone temple abutting the fortress was dedicated to Isis and Serapis. The gold decorations that once covered parts of the temple and earned it renown have long gone, but there is still some decoration on the inner stone walls.
Dush was a border town strategically placed at the intersection of five desert tracks and was one of the southern gateways to Egypt. It may also have been used to guard the Darb Al Dush, an east–west track to the Esna and Edfu temples in the Nile Valley. As a result it was solidly built and heavily garrisoned, with four or five more storeys lying underground.