A while back I read a post about someone who had spotted what looked like Nuclear Reactors from around 20,000 feet over New Jersey. I was in my F-15 Eagle cruising through the trees around Quantico, VA when I came across a pair of them at close range. No doubt about it, a nuclear power plant. It's pretty neat, and out in the middle of nowhere.
If you want to check them out yourself:
N38* 32.20' W76* 41.45