An Art Nouveau dreamscape featuring a steampunk-inspired airship gliding over a lush eco-metropolis thriving within the walls of an ancient, ivy-covered castle. The scene is bathed in the warm, golden glow of sunset, casting elongated shadows across cobblestone streets and rooftops adorned with solar panels. Artisans and inventors clad in Victorian garb stroll below, while whimsical drones shaped like dragonflies assist them in tending to lush vertical gardens. In the sky, bioluminescent lanterns float gently, illuminating a diverse mix of people gathered for a celestial music festival, where musicians with glowing, organic instruments perform on hovering stages. The fusion of intricate metalwork, flowing organic lines, and vibrant flora creates an enchanting tableau where history, art, and technology coexist harmoniously.