On my recent vacation to Alaska I couldn't help but notice some of the 100 plus year old mining, logging and railway equipment. Much of it was cast iron and had developed a deep rusty color that was a stark contrast to the lush green environment. And most of it had largely been discarded in favor of more modern methods. Of course my kids had fun just climbing all over it.
Here is a water canon that was used to soften the earth so the dredging equipment below could be used.
One picture I wish I had snapped was of a big screen TV sitting in a plywood box inside a decommissioned lumber mill. It played a movie on the lumber industry in Alaska. The contrast was a bit hard to take.