I am rereading the Batman and Son TPB and I have a question: In part one, "Building a Better Batmobile" Tim reports to Batman that crime is non-existent in Gotham. While he is preparing to spend some time in the mountains, Tim and Bruce discuss the possibility that he must become reacquainted with the idea of "Bruce Wayne"; Tim states that the a vacation might be a good idea, stating the last time they took a vacation Batman returned and wiped out super-crime in Gotham. Now to the question: what is the "last trip" that Tim refers to? I am dying to know. Thanks for the help.

@tcrighton: After Infinite Crisis, many heroes took a one year vacation, Batman took it with Nightwing and Robin (Tim Drake), in that time he repeated part of his training and he learned more but more importantly he did it because he lost his way and his morality was in an all time low(so he traveled in hopes of regaining his soul.