The Theatre of Marcellus, Rome.

“The Theatre of Marcellus (Latin: Theatrum Marcelli, Italian: Teatro di Marcello) is an ancient open-air theatre in Rome, built in the closing years of the Roman Republic. At the theatre, locals and visitors alike were able to watch performances of drama and song. Space for the theatre was cleared by Julius Caesar, who was murdered before its construction could begin; the theatre was advanced enough by 17 BC that part of the celebration of the ludi saeculares took place within the theatre; it was completed in 13 BC and formally inaugurated in 12 BC by Augustus.”