Château d'Entrechaux stands on a rocky peak above the village and is undergoing restoration. From the site, there is a good view of the village and of the surrounding area, extending to the castles at Crestet and Beaumont-du-Ventoux. Entrechaux, the Château de Crestet and the Château de Beaumont-du-Ventoux formed an effective lookout network.
Mainly dating from the 10th or 11th centuries, the Château d'Entrechaux is actually two castles. Begun around 900, the Petit Château (Little Castle), with its fortified chapel dedicated to St Quenin and a cistern dug into the rock, was built by the Bishops of Vaison. During a long period of dispute with the Counts of Toulouse, this castle was shared with the village lord. The latter constructed the Grand Château (Big Castle), below the first, with a square keep more than 20 metres high, a chapel dedicated to St Laurent and several other buildings, surrounded by ramparts. A gatehouse with a bretèche served both castles. The joint ownership lasted for about 450 years from c.1230.
A band of outlaws pillaged and began the destruction of the castle on 9 September 1792. The sale of stones by the municipality and vandalism by inhabitants led to its ruin. The castle was treated as a quarry.
The castle is private property. Visits are possible during the summer.
Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).