The castle fortress of Oppède-le-vieux is located at the top of the old village of Oppède, called "Oppède-le-vieux." It stands on the northern slopes of the Petit Luberon.
The medieval castle of Oppède-le-vieux is unfortunately in a state of ruin, however many walls are still visible, as well as few towers and passages. The visit to authorized areas must be done with great caution. The most attentive visitors will find engraved on a fortification stone a SATOR square. The SATOR square is a magic square, ie a square that reads both left to right as from right to left and from top to bottom as the bottom up. It contains the Latin inscriptions AREPO SATOR TENET OPERA ROTAS, all words of five letters.
Near the castle fortress is Notre Dame Dalidon Collegiate, or Our Lady of Sorrows, so dear to Michel Leeb. The ride that will take you to see one will most likely push you definitely to go and see the second due to their proximity.