I took this photo inside the ruins of a steel mill from the 1800's in the South side of Chicago. What's left of the site has been converted to a park (Steelworkers Park). In this photo you can see the inside of a portion of the structure. The colors in the walls are graffiti and in the distance at the end of the tunnel you can see a pile of boulders. Tunnel was dark so I used a long exposure. I only had a 200-600 lens with me as I was photographing birds, but this place caught my attention and could not pass the shot. I set the camera on a small folding chair I had with me. I used a Sony A7III with the 200-600G lens. F/11 1/4 sec ISO 640 200mm