#1 Mont-Saint-Michel Abbey (Mont Saint-Michel)
Mont-Saint-Michel Abbey is a defining symbol of France. Perched on a rocky island in the bay of Mont Saint-Michel, it is known for its medieval architecture, quiet cloister, Knights Hall, and oratory chapel. Founded in the 8th century, it was a major spiritual center during the Middle Ages. Today, this UNESCO World Heritage site attracts millions of visitors annually.