I have been using this site for a while now. It has many of the MN state parks, but some of the pictures are a little deceiving, so I use Google Earth with campsitephoto to try to get a better understanding of the campsites I want to reserve.
it says they take photos of only the MOST popular campgrounds only. They are expecting to have 1200.
They couldn't have a complete directory of all campgrounds. The time and space needed would be unbelievable.