Unfortunately, vampires are fantasy creatures, their not like Bram Stokers' Dracula, they were just made up to create an amazing story
As for Twilight, let's just say I find the books full of fluff and it made me mad how they portrayed vampires "sparkle" instead of burn in the sun. That's just my opinion.
You could read books though, Bram Stroker is a good author, I loved his book Dracula, you could also research Dracula, Nesferatu, Draculas' Castle, and Nesferatus' Castle, even though they're just stories, the castles are real, and they have some interesting history, if you like.
I used to be a huge fan of Ghost Hunters, Ghost Adventures, etc, I know they're probably fact, but they did an episode on Nesferatus' Castle that was pretty good, if you're interested in that.
You can also research the mythology behind vampires, I don't know much about it, but it's something.
I know this isn't the answer you are looking for, but I hope it helped a bit.