1. Cathédrale Saint-Sauveur
This cathedral is a chaotic, beautiful lesson in architectural indecision. Built over centuries, it mashes up Roman, Romanesque, and Gothic styles into a single structure that somehow works. You can literally stand in a Roman forum foundation, look up at a Romanesque nave, and walk through a Gothic portal all in one visit. It feels organic, as if the building grew and shifted along with the city itself rather than being planned on a drawing board.
Inside, the Baptistery is the star, with its ancient columns that predate the church itself, recycled from a Roman temple. The light here is different, filtered through the octagonal dome, creating a somber, respectful atmosphere. Among the various Aix-en-Provence attractions, this one demands you slow down and look at the details, like the intricate carving on the doors or the famous Triptych of the Burning Bush, which is often kept closed to protect it.
It sits at the top of the old town, acting as a spiritual counterweight to the commercial bustle below. The square outside is often filled with students from the nearby university, providing a lively contrast to the ancient stones.