You have to go down a lot of steps to get to what’s left of the furnaces, so not many people come here. That’s why I use this place, but it got me thinking all the same. This was where it started, where – like the historical marker says – we made the steel that won the Civil War. Now it’s four ruined rock walls. This used to be the heart of the city, or maybe the lungs for the great bellows it had. Now it’s broken and useless. The city’s own black lung . . .