The little metal shot balls that were once the standard projectile for all manner of guns used to be made using little more than heat and gravity, in tall spires called shot towers. Melted lead would be poured through a funnel at the top of the tower and drip down the length of the tower, naturally forming into little spheres as it fell and cooled.
While bullet manufacturing has gotten more high-tech since the days of the shot tower, you can still find the towers all over the world. Check out 10 of these monolithic reminders of a bygone trade.
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