This is a grand fantasy digital painting by renowned concept artist Chen Wei. At the center stands a magnificent castle, rising from a massive rock peak with layered architecture blending classical domes and futuristic spires. Bathed in clear blue skies and flowing clouds, sunlight pierces through to create a sacred and mysterious atmosphere. The background features rolling snow-capped mountains and deep valleys, with another city settlement visible on the right. The artwork uses cool blue-green tones accented with golden light, perfectly capturing the epic scale and serenity of a 'City in the Sky'.