Our Pick
Posted on @rawstates
The Anaconda stack
1919
Anaconda, Montana
SchmuckyTheCat at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons
Five hundred and eighty-five feet of brick, the tallest freestanding masonry structure in the world, built to throw smelter fumes high enough to stop them killing the surrounding farms. It did not entirely work. The smelter closed in 1980. The stack stands alone in a field.
That was 1 of the hidden places.
Location: documented spot
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