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

22. The Blue Lagoon, Iceland

While a popular tourist destination, Iceland's Blue Lagoon still offers an otherworldly experience, a surreal geothermal spa with milky-blue waters set amidst black lava fields. Its unique color comes from silica and minerals, which also give the water its therapeutic properties. The contrast of the steaming, almost opalescent water against the stark volcanic landscape creates a lunar-like ambiance. It's a testament to Earth's powerful geothermal energy, transforming a barren lava field into a tranquil, alien-looking oasis that feels like bathing on another planet.