A breathtaking underground cathedral, illuminated by shimmering crystals embedded in ancient stone walls. The ethereal light dances across the cavernous space, casting vibrant reflections on the smooth, polished floor. Stalactites and stalagmites surround the altar, which is adorned with intricate carvings. Above, a grand vaulted ceiling mimics the open sky, with delicate crystal formations resembling twinkling stars, creating a surreal, spiritual atmosphere.