What’s the coolest hidden spot in Key West that most tourists walk right past?

I just learned tonight what a folly is in a garden or landscape, and I immediately thought about this little structure I came across the last time I was in Key West.
We were there over Christmas last year, and on our last day I made my family walk through the neighborhoods instead of just getting a ride to the airport. They eventually got pretty tired of my idea 😂 and I finally gave in and called an Uber, but somewhere along that walk we passed this little structure that I had never noticed before.
I don’t know if “folly” is technically the right word for it, but now that I know what those are, that’s exactly what it reminded me of. Just this beautiful, almost unnecessary little place of peace that seems like it exists for no other reason than to sit there for a while. The kind of place you’d write a song or a poem.
Does anybody know what/where I’m talking about? I wish I could remember exactly where we were when I saw it.
One of my favorite things about Key West is realizing there’s still something there I haven’t seen yet. I’ve been many times, and every time I find some little street, house, garden, corner, or piece of history that somehow escaped me before.