As you all know, you cannot fly anywhere close to a nuclear facility. Here in Washington State however, we have the "nuclear plant that never was" Satsop. Construction began back in the late 70's and was never completed. There are two immense cooling towers (500 feet high) which can be seen for miles. As I was within 400' of the edifice, I flew my Mavic Pro to the top, and then some. I was cautious about flying directly over the rim due to concerns about losing lock on my controller, that the drone would be blocked by the tower itself. Maybe it would fly home automatically? Don't know and I didn't want to find out. Haven' t crashed my drone yet.