Dark mysterious atmosphere, medieval-inspired architecture, grand stone walls, vaulted ceilings, stained glass windows, ornate wood carvings, rich velvet drapes, mysterious candlelight, eerie shadows, abandoned asylum feel, distressed textures, peeling paint, worn wooden floors, old hospital equipment, dimly lit corridors, foreboding ambiance, ominous mood, warm golden lighting, cold blue tones, dark crimson accents, mysterious purple hues, haunting greenery.