Did you know Batman once fought Dracula?
He does so in the 2005 animated film Batman vs. Dracula. It may be worth checking out for some hardcore fans.
But did you know that he fought Dracula in the 60s? Well he did, but all the evidence that remains of this potentially awesome altercation no longer exists.
A reddit post lead me to look over a list of lost films. Most of the films were from the 20s and 30s early on, but there were a few lost films in the 60s and 70s.