The city hosts eight ancient Egyptian and five ancient Roman obelisks, together with a number of more modern obelisks; there was also formerly (until 2005) an ancient Ethiopian obelisk in Rome. The city contains some of obelisks in piazzas, such as in Piazza Navona, St Peter's Square, Piazza Montecitorio, and Piazza del Popolo, and others in villas, thermae parks and gardens, such as in Villa Celimontana, the Baths of Diocletian, and the Pincian Hill. Moreover, the centre of Rome hosts also Trajan's and Antonine Column, two ancient Roman columns with spiral relief. The Column of Marcus Aurelius is located in Piazza Colonna and it was built around 180 AD by Commodus in memory of his parents. The Column of Marcus Aurelius was inspired by Trajan's Column at Trajan's Forum, which is part of the Imperial Fora