Just complete the game, dlc does not have to be used to unlock those areas.
Go to the top of each tower/building/spot indicated by the map and press try angle to synchronize.
You need to find the viewpoints and climb up the tower located on your mini map and sychronize, triangle button for ps3 and Y for xbox.
Make sure you have all the viewpoints it has a weird symbol on the map but if you look at the legend you should be able to see it. You basically climb the tallest buildings on the map in search for a little ledge. You walk out on the ledge and press y/triangle depending on the game system you have and it will pan out and show you the whole area you are in and then on your map you should have the area it shows you.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.