These types of structures really spark my interest. Was there more to the building or was it just the wall/stairs? Any idea what the building was? Cool pics!
There was more to it, I'll post some pictures from other angles. It was built in the early 1930s as a bathroom after the area was turned into a park (it's within Forest Park, the largest urban park in the US at just over 5,000 acres). It was abandoned in the 1960s.