A cave with a pool and a waterfall inside of it

a forgotten underground city carved into the depths of a massive, subterranean crystal cavern. The city's architecture is a blend of natural crystal formations and intricate, ancient structures. Bioluminescent flora and fauna illuminate the cavern's colossal crystals, casting a soft, surreal glow. A network of luminescent pathways connects the city's districts, while aerial trams glide silently through the cavern. As night falls, the city comes alive with a symphony of lights, creating a breathtaking display of colors and reflections. Capture the enchanting and mysterious atmosphere of this hidden underground crystal city

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