Instead of the Colosseum, try the Theatre of Marcellus
Theater

© domonabikeItaly / Alamy Stock Photo
Despite the two buildings bearing more than a passing resemblance to one another, the Theatre of Marcellus actually pre-dates the Colosseum by almost a century and certainly provided inspiration for Vespasian’s amphitheatre. Begun by Julius Caesar and inaugurated by Augustus in 12BCE, it’s dedicated to the nephew and heir of the latter who died before it was completed. Although the site can only be viewed from the exterior, in the summer, classical music concerts are held regularly at the theatre, allowing participants a peek inside.