Hiraeth. In Welsh: a homesickness for a home to which you cannot return, a home which maybe never was, the nostalgia, the yearning, the grief for the lost places of your past. It has no direct translation in English.
I never knew that there was a word that covered the meaning of what I've always felt in my heart. I wonder if we could expand it a little bit to make it mean "a home that'll never exist"? Because then it may be linked to traveling.