From White Sands and the Great Sand Dunes to Bryce, Bisti, Bonneville, and Petrified Forest, these 10 U.S. landscapes feel almost extraterrestrial, shaped not by lava but by gypsum, salt, sandstone, ...

America's geological wonders don't need erupting volcanoes to create breathtaking spectacles that look straight out of a science fiction movie. From towering mushroom-shaped rocks to mysterious moving ...