The Pantheon in Rome. An impressive and large building which is almost 100% intact.

The Pont du Gard in Provence, France. The most beautiful and best-preserved aquaeduct. It is still used as a road bridge.

The amphitheatre of Nîmes, France. The best-preserved amphitheatre (the one in nearby Arles comes second).

The theatre in Orange, France. The best-preserved theatre.

The Constantine Basilica in Trier, Germany. The emperor’s audience hall, almost 100% intact.

Constantine’s triumph arch in Rome. The best of its kind, only rivalled by the one in Orange, France.

Maison Carée, Nîmes, France. The best temple.

The Palace of Diocletian in Split, Croatia. Best example of an emperor’s palace.

Domus Aurea, Rome. Nero’s palace from the inside.