How did that get there?

So this morning I was (shock) hiking along, minding my own business when out of nowhere, I see this:





It's obviously long-abandoned and in very poor repair. I didn't go closer to check things out (I'm a rule person and the rules say to stay on the trails). From what I could see, though, it was made with semi-modern building techniques. There were rain gutters, plaster and lathe walls, red brick foundation, and a tin roof. Did I mention that I was an hour's walk away from any road? How the heck did all those building materials get there? And when? The picture doesn't show scale well, but the house is twice as large as the house I grew up in. This is not a 'little cabin in the woods'.

Curious.