Thankfully Google Earth allows you to export images, so we have this picture of "The Glow" from Purmerend, Holland.
I think that it is a secret launch site, a homemade rocket base waiting for the go signal so that some home owner can launch themselves into the depths of outer space. Or, perhaps in an even more sinister manner, it is a landing site. Perhaps they didn't think that the satellite sweeping overhead could be accessed by something as mundane as a random Google user who would spread this all over the internet.
Regardless, this is the start of an adventure for any number modern day RPG scenarios, from super-heroes to horror to conspiracy. Now that you have the first piece....what comes next?