What would be the best way to protect a room from unwated visitors in a low-tech fantasy world?

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.

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You can spread powder on the floor so you could see if someone had stepped in. It wouldn't keep them out unless they didn't want anyone to know they'd been in there.

45 comments