Review #400 is for one of my most favorite attractions in Vegas. I never tire of watching the Bellagio fountains. And it's free! Every 15 minutes in the evenings, half hour during the day. The sound of the large jets blowing the water sky high leaves me spellbound.
I did see a show on the Discovery Channel on the making of the Bellagio and the fountains. There is a control room with cameras and sensors in the basement of the Bellagio and they do maintenance on the jets by sending scuba divers down. I've never seen that, though.