The answer is an obvious no to who ever played on rookgard, some Rookgaard. Some door just dont don't have a key to open them only them. Only the key 0000 would work but that doesnt doesn't work since it was turn to wooden long time ago, not ago. Not all the door in tibia are made to be opened i opened. I cant think of a place without a door that cant can't be opened hope that answer you question, and question. As for the secret place i I would have to say in rookgard Rookgaard there are many unsolved misteries, mysteries like the maze of fury or the way to the "fury sword" (spike sword in rookgard)
here Rookgaard)
Here is a video that most people consider fake but is supose supposed to be a way to get to the maze of fury "https://www.youtube.com/watch?v=E1cfFdnVIYw"