Today on a local ride, I ventured thru Chatsworth (CA) Park with a couple of historic old houses nearby. I found this dynamite storage shed made out of thick sandstone blocks. It was built in the 1890s and used by a local quarry, and later by the railroad. I Googled "Chatsworth dynamite shed". Apparantly the plan was to have thick walls and a flimsy tin roof, so any unplanned explosion would be directed up, instead of out. Good thinking. I've lived and ridden around here 40+ years and never noticed it before. The dynamite ride is a '78 Super Course, which began as a $20 CL find.
