A kastel is not a castle in Gaziantep but a water distribution centre that has also sanitary and religious functions. Under the surface of Gaziantep there are large streams of water. ‘Nobody knows where they come from or where they go but we have always used them’, my guide said. He showed interesting parts of the extensive underground channel system. And we went into the oldest kastel, Pisirici Mescidi ve Kasteli from the 13th century. It looked very beautiful, well taken care of. In the different ‘niches’ you see on the picture above are toilets and baths where people could wash themselves. The water is very clean and also cold; it is not like a Roman bath where heating systems were in place. The roof was made so that good airconditioning for the kastel was secured, both in cold and in warm seasons, to have some kind of pleasant ‘average’ temperature continuously.
On the other side of the water reservoir room, there is a mescid, a room for prayer. They were often combined with the underground water reservoirs because it enabled believers to have their rituals in washing according to the islamic rules. Book shelves formed a small library in the mescid. Thus multifunctional centers existed already at very early stages in Gaziantep. Kastels are not very large and they won’t take a lot of your time when you visit them. But they are worth your visit as they are unique and refined in shape and light.
An interesting and large description of the kastel systems and six specific kastels in Gaziantep can be found here: https://whc.unesco.org/fr/listesindicatives/6345/ and for Turkish readers: http://www.gaziantepturizm.gov.tr/TR-52360/kasteller-ve-cesmeler.html