A boy atop Coronado Heights, near Lindsborg, looks down the sights of a pretend rifle as he imagines holding off attackers to the fort. I visited the castle several times as a child, and thought it was really built by Coronado. The structure, though, was never really built to defend that area. Instead, it was built by the WPA in 1936 as a recreation and picnic area.
Is that sandstone, Dave?
It looked like sandstone to me. It was constructed from native rock, and the top of the hill is capped with Dakota level sandstone.