Batman is one of the most popular comic book characters of all time. To celebrate the comic book hero, several artists reimagined what the caped crusader would look like in different scenarios and time periods. These artists took the Bruce Wayne we all know and love and used their imaginations to place him in different scenarios, rendering him to fit the settings.
The Iron Batman
The real Dark Knight, with an emphasis on Knight.
Batman of the Underworld
Nuclear War Batman
Renaissance Dark Knight
It certainly would be interesting to see the types of villains Batman would encounter in these alternate realities. I'd read these Batman comics anytime. Each one would be a totally different story from the others.