Berlioz: Les Troyens.

This epic opera follows Virgil, beginning as the Greeks appear to have ceded the field after ten years of the Trojan War. Cassandra tries to warn of the terrible fate to come, but fate is set and Troy falls. The first two acts cover this tragic end, then the flight of survivors to Carthage and events at Carthage continue in acts 3 - 5, culminating in the further voyage for Italy and Rome. This is Virgil's classic epic, in operatic form, in about a three and a half hour performance from French Opera.