Believe it or not, this is a Montana State Park, the Anaconda Smoke Stack State Park. It is not open to the public and can be viewed only from a distance.
Built in 1919 as part of the Anaconda Smelter where the ore from the mines in nearby Butte was melted out of the rock, the stack stands 585 feet tall and has an inside diameter of 75 feet at the base and 60 feet at the top. It can be seen from a distance of 20 miles away, and for comparison sake, it stands 30 feet taller than the Washington Monument. It is the tallest free-standing masonry building in the world.
The mines closed down and the smelter was demolished in 1981, but the people of Anaconda started a drive to Save the Stack, and were successful. (A similar stack just outside Great Falls, Montana, was demolished when the mines closed.)
Taken 7/15/2010 in Anaconda, Montana.
Nikon D80 DSLR, Nikkor 16-85 mm wide angle/tele/zoom lens set at 85 mm.
ISO 100, f /5.6, 1/750 second.