Depending on which historical records a person reads, they might find a lot about Dracula. Unfortunately there is no historical account of a Count Dracula; he was a character in a novel. Transylvania is a real place, but the Transylvania that most people call to mind is the one with a vampire.
The history of the Bathory clan does come up with one person who might fit the "vampire" ideal: Elizabeth Bathory. Although not directly related to Vlad Tepes Dracula, she was known to have killed hundreds of young women, all in an attempt to keep her youth.
Bran Castle and many other castles were falling into disrepair.
The most interesting part of the Dracula and Transylvania connection is that there are still people who are direct descendants of Vlad Tepes. Some, are even Royalty. The Kingdom of Hungary and its rulers and nobility were never too happy with Vlad Tepes, and they would have been pleased to see him as a vampire.
There is more to this story. The Saxons of Transylvania wrote quite negatively about Tepes, and this lead to many myths about Dracula and Transylvania. But sometimes facts are not as good as fiction.