585 feet tall. Built in 1919.
At 585 feet tall, it was once the country's tallest smokestack - the Washington Monument could fit inside it - and it used to benevolently belch lead and arsenic over residents. In 1980, smelting operations closed, and the stack was threatened with demolition. Proud Anacondans banded together, and the stack was saved, becoming a Montana State Park. Only now the Federal DEP has fenced it off, saying that the site leaks arsenic.