Why is Transylvania related to vampires?
A lot of famous people that lived in Eastern Europe were associated with blood.
In the Transylvanian Mountains or in the Urals Mountains are some local notorious legends related to vampires.
Probably the best known person associated with Transylvania's vampires is a Romanian noble (more commonly known as Vlad the Impaler) with a reputation for excessive cruelty. He was Bram Stoker's inspiration for Count Dracula novel.
It is believed that Vlad the Impaler was locked in this castle:
It is believed that Vlad the Impaler was locked in this castle: