I seem to remember that this church was featured in one of the James Bond movies. The movie I'm thinking of is License to Kill where they flew an airplane into the old Seven Mile Bridge near Pigeon Key in the middle keys. Bond isn't really my favorite, and the bridge still stands, just like this gleaming white church.
This would be the St Paul's Episcopal Church and is a beautiful building to see. It must be since I and many other photographers are all milling around taking pictures of the place. The day I was there, there were at least 4 other people taking pictures, in fact you can see the head of one in the lower left corner. I'd photoshop it out if I were to do anything with this other than post it here.