Here at The Carrie Blast Furnaces the door to the forced-air stove is closed, which is a good thing because it can be a few thousand degrees in there. Hot enough to melt iron, for sure. Built in 1884 and operating for nearly 100 years along the Monongahela River near Pittsburgh, Pennsylvania, at its peak the massive 168 acre site produced more than 1,000 tons of iron a day in the heart of the American steel industry. It was designated as a National Historic Landmark in 2006.

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