No, you’re not looking at a scene from an old Superman film, just Mexico’s “Cave of the Crystals”. It’s connected to the Naica Mine 980-feet below the surface in Naica, Chihuahua, Mexico. The main chamber contains some of the largest natural crystals ever found, but unfortunately, it’s extremely hot, with air temperatures reaching up to 58°C (136°F) with 90%-99% humidity. The cave is relatively unexplored due to these factors. Continue reading for more other worldly places that exist right here on Earth.