sanctums
n. (寺廟或教堂的)聖所( sanctum的名詞複數 ); <口>私室
If you refer to someone's inner sanctum, you mean a room which is private and sometimes secret, where they can be quiet and alone.
His bedroom's his inner sanctum.
臥室是他的一方淨土。
A sanctum is the holiest place inside a holy building such as a temple or mosque.