You've got to watch this amazing Batman animated short from producer Bruce Timm. It's called Batman: Strange Days, and it was made in celebration of Batman's 75th anniversary.
The short is described as "a lost tale from Batman's past, the Dark Knight tracks a strange giant to the mysterious lair of Dr. Hugo Strange."
I absolutely love the the 1940s film noir and horror atmosphere that is has. It's actually based on the earliest version of Batman, and they set the story in that era. I also like how Dr. Hugo Strange was used as the villain because he was Batman's first real supervillain in the comics.
This made me really miss Batman: The Animated Series. I would love to see a new series with this setting and style.