I’m heading back to last July’s NxNW trip to Pittsburgh this week with a few more pictures from the Carrie Blast Furnaces National Historic Landmark where we spent a fascinating, if damp, evening photographing huge steel-making machinery. Here’s an image of part of the blast furnace itself.
You can find all my images from the trip at https://davewilson.smugmug.com/Travel/NxNW-2025-Pittsburgh.
For the technically inclined...