A vast ruined ancient city inside a cave with a turquoise river, boats and temples lit by sunlight from an opening above

Prompt

Masterpiece, best quality, ultra-detailed cinematic fantasy illustration of a massive ancient ruined city built inside a giant cave. A wide turquoise river flows through the middle with several wooden boats carrying people. Tall, broken stone pillars and temples line the riverbanks, with sunlight streaming down from an opening in the cave ceiling. Dramatic lighting, hanging vines, and glowing particles create a mystical atmosphere. Highly detailed architecture, water, and lighting. Epic and awe-inspiring composition, best quality, 8K resolution.