Re: dungeons and dragons (D&D) anyone?
Is this your groups first time going to clear out a castle? If yes, maybe you don't need to do anything fancy then, because hopefully that by itself would crate a special moment in a RPGer's life. Castles are cool by themselves all you need to think about is what you and others find so awesome about them in real life and make a lot of those points clear in the game, even if they are mundane. Describe the grandeur of what a famous fantasy castle feels like and how even if normal elements can feel larger than life. Maybe describe how many heroes of the past went in and meet their end in it, how forbidding it is, and how this might be the step where they characters really have to put on their big boy pants because to be at this points means they are in the big leagues. Then you can add in all the non-mundane stuff from fantasy like all those secret rooms, traps, illusions and other things to make it even greater.
Is this your groups first time going to clear out a castle? If yes, maybe you don't need to do anything fancy then, because hopefully that by itself would crate a special moment in a RPGer's life. Castles are cool by themselves all you need to think about is what you and others find so awesome about them in real life and make a lot of those points clear in the game, even if they are mundane. Describe the grandeur of what a famous fantasy castle feels like and how even if normal elements can feel larger than life. Maybe describe how many heroes of the past went in and meet their end in it, how forbidding it is, and how this might be the step where they characters really have to put on their big boy pants because to be at this points means they are in the big leagues. Then you can add in all the non-mundane stuff from fantasy like all those secret rooms, traps, illusions and other things to make it even greater.