Identify.

Theatre of Marcellus, Rome, dedicated 13 or 11 BCE, Marcellus had been married to Augustus's daughter, he was well-liked and his death was mourned by the "royal" family, tufa, concrete with opus reticulatum (individual diamond shaped bricks placed), faced with travertine, traditional roman theatre, stage taller than seating, covering that could be pulled out over seating, shrine to get around he laws, mixed column style (each level had its own style)