During a new visit in 2015 I took many pictures that I combined into panorama's, so you get a better wide-angle feel of the place, whereas the pictures following the panorama's are the constituent and more detailed individual pictures.
The Baptismal room and its pool in the centre seem to be the best preserved in Turkey, and are impressive. The room is octagonal. From several sources I gathered it must be from the fist half of the 6th century. I took some pictures from the outside in 2015.