Sometimes they fence trees to protect them from deer.

I used to live in an older (1925) house. Several times, when I was downstairs, I heard footsteps and someone yell "hello" down the stairs. The first few times, I answered, and then, receiving no answer, went upstairs to see if someone had come into the kitchen from the back door. Of course (or I wouldn't be telling you this), no one would be there. I thought maybe it was one of our cats, mimicking our habitual greeting to them as we came in the backdoor, but how to explain the footsteps? I played it off as imagination for a while, but when I finally mentioned it to my wife, she related that she had heard it also. Old house? Cats? Who knows... but it was amusing and hair raising at the same time.

mmmmmmmmmm - Lung disease in a box!

There is a similar engine in the Grand Rapids (MI) Public Museum - they were used in manufacturing back in the day to run the overhead cams and belts. It certainly would be worth it to preserve this.

Based on the time period, it probably was a ballroom / hall.

I blew it up using photoshop. It is hard to tell, but I believe it is something printed on a screen behind the window: like an illustrated human body, or some other anatomy illustration.

It was probably panelled with decorative metal panels.