Prompt: Crystal Cavern Sanctuary: A hotel nestled within the heart of colossal crystalline caves, where every room is carved from precious gems that softly glow in a myriad of colors. Luminescent fungi create a natural, bioluminescent ambiance, casting an otherworldly glow. The scene is depicted with the precision and surreal brilliance of Yoko Honda's retro-futuristic aesthetic, blending vibrant colors and geometric shapes in a harmonious display.