Now that is weird. I know that many people are suggesting that you had your finger or your entire hand over the lens. That may be the case, but I don't buy it. For @dandays not to see those two pics when he reviewed them shortly after taking them and then to look at them again in the car and not realize something went wrong isn't your style. You are the dude with the keen eyes, the dude that picks up on even the smallest imperfection of an article.
Orbs for sure!
What a beautiful place. It's great to see old structures like Oliver's Cabin be maintained. Old buildings like this one still have their place as they give us a glimpse into the past. A few of the pictures you took while inside of the buildings show just how skilled those old homesteaders were.
good article my friend!