Neosho Falls, KS
This is the high school or what remains of it. It was originally built in 1939 and was abandoned in 1969.
Neosho Falls was founded in 1857, but when the railroad to it, moved away, the town floundered until finally in 1951 a massive flood all but destroyed the town. The population has dwindled down over the years to where's it at now, which is around 200.