I had one place missing too, but don't have the patience to search all places over and over again.
So I wrote a little program which lists the missing few places.
Quick and dirty and not too comfortable to use, but I won't need the program too often
Just copy the savegame file to a PC and open it in http://www.rg-brille.de/etc/AT/AT_checkPlaces
Thus I found my last place