25 Unique Natural Wonders That Look Like They Belong on Another Planet

24. The Grand Prismatic Spring, Yellowstone National Park, USA

Yellowstone's Grand Prismatic Spring is a riot of vibrant, concentric colors, making it America's largest hot spring and an undeniable earthly marvel. Its dazzling spectrum, from deep blues and greens in the center to rings of yellow, orange, and red at the edges, is created by thermophilic bacteria thriving in the varying temperatures of its mineral-rich waters. The steam rising from its surface adds to its ethereal, otherworldly aura, making it feel like gazing into a massive, colorful alien eye.