If you're fascinated by whimsical 1960s and '70s architectural wonders, make sure to visit La Grande-Motte. This coastal town near Montpellier boasts experimental futuristic buildings that create a unique, otherworldly atmosphere. For a taste of this retro-futurist charm intertwined with the calming rhythm of the sea, consider planning your trip for September when the weather in Saint-Pierre-d’Oléron is mild and comfortable at around +19°C.