Orange's two Roman monuments — the Théâtre Antique and the Arc de Triomphe — share the UNESCO inscription and can be seen in a half day. The theatre is the only Roman theatre in Europe with its original scaenae frons (stage wall) still standing, a 37-metre-high screen of stone that Louis XIV reportedly called "the finest wall in my kingdom." The arch, a kilometre north of the centre, is one of the oldest surviving triple-arched Roman triumphal arches anywhere, raised around 27 BC.
Beyond the antiquities, the old town is a small grid of Provençal streets centred on the Place de la République and the Cathédrale Notre-Dame-de-Nazareth. Climb Colline Saint-Eutrope behind the theatre for a view down into the cavea and across to Mont Ventoux. In July and August the theatre hosts the Chorégies d'Orange opera festival, France's oldest, founded in 1869.