Concentrated Thermal Solar
It looks like a UFO, but we assure you that it is man-made. This massive device appears to be some power source; the huge mirror reflects light onto a tower, and the heat is used to run a steam engine or another heat-requiring engine.
We do, however, think that something like this can only be utilized in locations where this much space truly exists and we can’t help but question how effective it is. Still, it’s a pretty amazing sight to see while traveling!