I suggest picking a span size that will be the optimum size for the photo widths that you have as span will determine the carousel width. Larger images will shrink to the span width. Smaller images you could 'upsize' by placing them in a larger image with a solid (or transparent) background.
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.