There are better ways of presenting Batman as an everlasting symbol than having rookie cop with no ninja training find the bat cave. Man that shit was forced.
The statue and return of the bat signal immortalizing him did some of that legwork already. They just needed to cap it off with something else that wasn't so goddamn hokey and embarrassing to the rest of Nolan's films.
I thought... could be wrong... that Bruce snuck the coordinates of the Batcave to him... he finds a piece of paper in his gear with the coordinates and that's where he goes