I don't really learn when I travel but before I go on a trip. I try to learn at least basics so I can have a simple conversation.
To learn the language properly though, one should live in the country where people speak in this language for quite a while.
I try to take in as much as possible. I'm learning spanish and I always try to learn a new phrase when I visit Mexico.
This is entirely up to you: if you are a fan of hitting the popular tourist spots then chances are you won´t be learning much of the local language, but if you try to go on an adventure to find that hole in the wall restaurant that a friend of a friend of a friend told you about or just try to feel out the nooks and crannys of a foreign place you won´t only learn a lot about the language itself but also about the people as well, which in my opinion, is the most interesting part of traveling.
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.