I visited Baltimore when I was in junior high school, and this architectural aspect stuck in my head like no other. Many years later when I moved to Baltimore, seeing the Shot Tower felt like coming home. This cool piece of history is a must-see while in Baltimore. They would drop molten metal from the top of this tower, resulting in... you guessed it, ammunition in perfectly shaped balls at the bottom. It'll take you just a few minutes to look at, but it's conveniently located near the touristy area.
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