Under the old Roman bridge flows the Ouvèze whose course separates the town into two parts. On the left bank, the medieval town, called the "high town", clings to the abrupt flanks of the hill and surrounds the ruins of the 12th century castle. A promenade along the narrow winding lanes is an enchantment. You can admire the old richly ornate doors, the squares adorned with cool fountains, and the panoramic view from the summit will compensate for the effort of climbing to the top.

On the right bank of the Ouvèze the lower town stretches out. The Roman town has been uncovered over an area of 15 hectares, revealing a rich Roman city, capital of the Voconces, a Gallic people allied with the Romans.

The Roman Theatre houses prestigious cultural events, such as the Festival of Vaison-La-Romaine and the Choralies. The cultural events, concerts, expositions, conferences, theatre all year round make Vaison an authentic City of Art.