A photorealistic depiction of an underwater world, where a massive glass dome encases a fully realized, miniature city. Within the dome, a lush garden thrives amidst towering buildings, including a grand palace and winding roads that seem to disappear into the distance. Serene lakes and rivers flow gently, while a majestic mountain range rises in the background. The surrounding aquatic environment teems with marine life, as if the glass dome is a natural phenomenon, seamlessly integrating the underwater cityscape.