found at the site it may also have been a centre for the production or distribution of bronze artworks. Notable buildings Although only about half of Volubilis has been excavated, a number of prominent public buildings are still visible and some, notably a basilica and a triumphal arch, have been reconstructed. Many private buildings, including the mansions of the city's elite, have also been uncovered. They are especially notable for the fine mosaics that have been discovered in a number of buildings and which are still in situ in the houses where they were laid. The buildings were mostly made from locally quarried grey-blue limestone. Very little remains of the original Punic settlement, as it lies under the later Roman buildings. A large tumulus of uncertain origin and purpose stands approximately in the middle of the excavated area, between the old and new parts of the city. Various theories have been advanced to explain it, such as that it was a burial site, a religious structure of some kind, a funerary monument or a monument to a Roman victory. However, these remain unproven hypotheses. Public buildings Two major public buildings are readily visible at the centre of the city – the basilica and the Capitoline Temple. The basilica was used for the administration of justice and the governance of the city. Completed during the reign of Macrinus in the early 3rd century, it is one of the finest Roman basilicas in Africa and is probably modelled on the one at Leptis Magna in Libya. The building is long by wide and originally had two storeys. Its interior is dominated by two rows of columns framing the apses at each end of the building where the magistrates sat. The outer wall of the basilica, which is faced with columns, overlooks the forum where markets were held. Small temples and public offices also lined the forum, which would have been full of statues of emperors and local dignitaries, of which only the pedestals now remain. Not much is known about the public buildings which existed in Volubilis prior to the start of the 3rd century, as the buildings currently visible were built on the foundations of earlier structures. The Capitoline Temple stands behind the basilica within what would originally have been an arcaded courtyard. An altar stands in the courtyard in front of 13 steps leading up to the Corinthian-columned temple, which