Imagine an expansive underground city, hidden beneath the Earth's surface for millennia. This mystical city, Agartha, is illuminated by a soft, ethereal light that seems to emanate from the city itself, giving off a warm, golden glow. Advanced technologies, far beyond current human understanding, coexist harmoniously with nature. Majestic buildings crafted from crystal and precious metals reflect the light, creating a breathtaking spectacle. Mythical creatures, like dragons and phoenixes, roam freely, watched over by enlightened beings who possess ancient wisdom. The air is filled with a sense of peace and wonder, and esoteric symbols are etched into the architecture, hinting at deeper truths waiting to be discovered. This scene captures the first moment an explorer beholds the hidden kingdom of Agartha, a world of unimaginable beauty and mystery.