ADVERTISEMENT
Rio Tinto, Spain
Rising in the Sierra Morena Mountains of southwestern Spain, this 60-mile (100 kilometers) river gets its stunning orange and red colors from copper, iron, and other heavy metals. The best way to enjoy the beauty is by visiting the small mining town of Nerva. Note that only about half the length of the river features these colors. Once you reach the town of Nieba it looks like just another boring, non-toxic river.
