Spectacular grey limestone cliffs and pink and white granite formations rise 1,200 feet above the canyon's narrow floor. Lost Creek Falls, in the northwest corner of the park, cascades over...

The old Anaconda Copper Company smelter stack, completed on May 5, 1919, is one of the tallest free-standing brick structures in the world at 585 feet, 1.5 inches. The inside diameter at the...