Best Views of the Grand Canyon
Scientists still don't entirely comprehend the 1.5 billion year history of the Grand Canyon; it's a story of erosion that has created one of the most breathtaking sites in America. (02:29)
Scientists still don't entirely comprehend the 1.5 billion year history of the Grand Canyon; it's a story of erosion that has created one of the most breathtaking sites in America. (02:29)