I need this for a book I’m writing. A lot of people know about the existence of the room I’m talking about, but almost nobody has access to it.
Not build a door or windows.
It would have to be well hidden or well guarded. Indiana Jones and Tomb Raider come to mind as well.
As many potential rooms as possible in as many locations as possible, and no way to distinguish the right one. Of course, rotate it regularly.
What does the room contain? If it’s a valuable artifact, surround the room with rooms with mundane objects, and build the room around the valuable artifact without any doors or windows.
If the room contains some kind of social circle or government function (think the 5 elder stars in One Piece), I think you’d again try to make the room seem unremarkable, but this time post a guard INSIDE the door. Possibly with an antechamber between the actual room and the hallway so that it seems like there’s just a guard in an empty room. Maybe you post many guards there and make it look like its their off duty room where they just hang out
Magic can McGuffin any answer you need but it sounds like you want a non magic means to keep people away.
Have a guarded door, be it creature or armed guards. The room that is guarded is not the real room, just a place to hold private meetings. It’s used on the regular to keep the focus on the guarded room.
The real room is in the town’s bizarre. It’s passed by all of the time and is curated by the most hated man. No one likes going to his shop. He’s rude and his wares are over priced. Within his shop is the real room that is visited by the few who know.
