I'd heard a lot about Sloss Furnaces from fellow shutterbugs, so when I had the chance to visit at night with my photography group, I snapped up the chance. Here's the scoop: 1) it's FREE! 2) it's self guided and 3) there is a restroom and gift shop onsite. I've heard that Sloss hosts concerts and special events. I bet that's pretty cool, too.
The best thing to do is to grab a map in the reception area, then head out and explore. Watch where you're walking. There are hanging metal pipes above and uneven footing below. Make sure you go underground. There are some cool tunnel spots that are really interesting and will make great photos. Definitely bring your tripod! Also, lots of great lines, textures from the cracking and peeling of the rust.
Follow the map and hit all of the suggested spots. There are informational signs at each spot that explains what was happening when this site was functioning and tells you about the people who worked here. You can also learn why it's called pig iron!
One quick note about the bathrooms -- they were in pretty bad shape when we got there. No TP and the soap dispenser was dirty, looks like it's been filled and refilled about a million times. I mentioned it to the lady working there. She apologized and quickly went into action.
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