Human memory is a marvelous but fallacious instrument. The memories which lie within us are not carved in stone not only do they tend to become erased as the years go by but often they change or even increase by incorporating extraneous features.
You travel with the hope that something unexpected will happen. It has to do with enjoying being lost and figuring it out and the satisfaction. I always get a little disappointed when I know too well where I'm going or when I've lived in a place so long that there's no chance I could possibly get lost.