Follies are often interesting. I was right about it being a fairly new building in the style of one much older, I see.
You still haven't explained why you took the shot, though. Whilst coming across a castle in a small town in Ohio may be an unusual experience (beware of claiming that anything is unique!), I don't get any of that feeling from your image. There's no context: it might as well have been in the middle of nowhere.
I fail to understand why building a stunningly beautiful home, filled with beautiful objects d'art would be a folly. Perhaps you're one of those people who don't enjoy art or beautiful, unusual architecture.
The meaning here is just as simple as art or life itself, or for some people, just as mysterious.
And indeed, it could have been in the middle of nowhere, but now that you google'd it, you know more than that.
BTW, this is a place you can walk through, touch, and photograph at will.