Picture Question About Transylvania and Published Works

Which are the links between these four pictures? It might not be what you expect because it relate more to England and not to Transylvania itself right away. In fact you might not think that these have anything to do with each others, but then again are you sure?

This is Bran Castle a book made it more famous than before.  That book wasn't written by someone who lived in Transylvania.

What writers need to work with.

A castle of the most infamous of the Bathory clan. This isn't related to a man but rather to a woman of this famous Hungarian family.
Some other instruments a writer can use to be published... still can't guess?