Ostia Antica (Ostie) - The theatreThe theatre was built under the reign of Augustus at the end of the 1st century BC and was a majestic and imposing structure big enough to hold 2500 people. At the end of the 2nd century it was further amplified to bring it to a seating capacity of 4000.Ostia Antica ; large archaeological site; was the harbour city of ancient Rome; 25 km southwest of Rome; Italy (2018)