That was my thought, it's interesting when you come across stuff like that, I wonder what other things like this are out there?
I remember during a houseboating trip on Lake Powell in Southern Utah with friends back in the late 80s, we had landed the houseboat at the end of a really remote channel, far off the beaten track. I went off alone, hiking into the rocky hills for awhile. When the trail I was on came to a natural end, I sat down to take a break. I was looking around, taking in the scenery, and I happened to glance up the rock face near me.
I found the remains of an Anasazi Indian cliff dwelling ruins high up on the rocks. It wasn't big - about three rooms, so maybe enough for a family or two. There were slight indentations cut into the rock surface that made a perfect staircase up to them. I went back to the boat and collected my friends, and we spent quite awhile exploring the ruins. We weren't the first people there, obviously, (there was a trail that ended just below the ruins, after all), but it wasn't documented on any of our maps. We all thought it was so cool to see. I've thought in the years since, what if I hadn't decided to take that walk? We'd never have seen it.
This metal monolith is kind of like that. If nobody happens to see it, then what?
Dave