The resplendent vaulted halls of this 10th-century abbey, within Fort St-André, can only be visited by guided tour. The stunning terrace gardens, however – built atop the abbey vaults and classed among France's top 100 gardens – can be freely roamed. Pathways meander among fragrant roses, iris-studded olive groves, wisteria-covered pergolas and the ruins of three ancient churches. The views of Avignon and the Rhône are spectacular.
