The marker is not even for the comic itself but is however named after the Yellow Kid because of a yellow vein found in a tunnel in California that was given the name Yellow Kid Tunnel. The tunnel itself is an entrance to the New Almaden mine during the years 1894 to 1896. The mine contains cinnabar and mercury ore with cinnabar and mercury being poisonous materials to mine for. The New Almaden mine was two hundred feet long, eighty feet deep, and can go from thirty to seventy feet wide with the mine being held in support by strong timber as reinforcement in case of collapse.
Not that far away from the tunnel is what is called English Camp where the workers of the mines used to stay with their families when the mine was still in use with a school not far away from the camp.