What set is this brown (wall?) element from? While sorting out some old Lego finds, I stumbled across this piece:  



I have absolutely no idea what this element could be for other than some kind of wall part, and even then I have never seen anything like it before. It is the same colour as some "wooden" elements I have,but I honestly have no clue.

Any information about the piece and any set(s) it was present in would be great.
It looks like this piece; Door 2 x 5 x 5 Swivel, Flat Base.  

  

In this case it was part of LEGO Set 6089, Stone Tower Bridge.