This photo comes to you from one of my recent adventures: exploring the old Tecumseh Mine with the infamous Copper Country Explorer. These old mines are really surreal -- huge amounts of poor rock spread all over the place, not in piles, but in huge fields.
One of our other finds was this old powderhouse. It is a poured cement building with a curved cement roof, hidden among the overgrown weeds and flowers. This building would have been used to store explosives (probably black powder) used in the mine. It sits here all alone next to an old trail, slowly being taken over by nature.