The Temple of Jupiter was built on top of an enormous barrel vault above the oval forum. The entire slope was artificially designed in order to be able to build the Jupiter temple at this point. Its grounds had previously served as a sanctuary to various deities. A temple to Zeus was most likely built on the site in Hellenistic times. One indication of this is that the location of the Temple of Jupiter does not fit into a typical Roman city map. The ruins that can still be seen today date from the 2nd century AD. The temple walls, parts of which still stand today, are about 10 meters high. The temple itself rested on a platform 41 meters long and 28 meters wide. Following the Syro-Nabataean style of construction, a staircase led to the roof of the cella. The Holy of Holies was originally surrounded by 38 columns, three of which are still original today. Other columns were re-erected as part of the Jordanian Antiquities Administration's restoration program.