There are at least a dozen derelict schools in Gary Indiana, including at least a couple of High Schools. I know this for a fact, because during our visit we were able to explore two of them. One of them was Horace Mann High.
We spent a good 2-3 hours in the sprawling complex looking for compelling things to shoot. And while much of the facility was either too dark, or too far gone to get GREAT shots, we were not at a loss.
This science lab was my favorite spot. Some furnishing, a spattering of graffiti, a couple of pieces of equipment… perfect.
If I could only find a lab partner!