At the foot of the Acropolis hill is the so-called "Red Basilica" with its imposing twin towers. This vast brick structure was originally built as a temple to the synthetic late Roman cult of Isis, Serapis, and Harpocrates. It was viewed as the throne of the Devil by Christians (see Revelation 2:1-7) but later converted by them into a Christian church. With the coming of Isam the tower on the right was converted into a mosque which is still functioning today.
It also features very nice restrooms in the building behind the ticket booth.