I don't think it is reasonable to expect a Google interviewer to ask you about your "stories ... from travelling around the world." Their primary reason for hiring you is for your ability as (I'm assuming) a developer. Although your travel experience may make you a more interesting person, that isn't altogether the point of the interview.

I guess you could say that measuring the "likeableness" and culture-fit of a potential employee is important, but that can definitely be derived from the interview in general rather than from your life stories.