A few days ago I had a dream about a place I'll call The Lending Library.
Basically the dream started out with me and a guide in an underground vehicle of some sort. We were going through an underground cave, really narrow and dark. Eventually the walls shifted from rough rock to concrete and a bunch of old, disused furniture littered the passageway. For some reason we had to be deathly quiet even though it was weirdly silent, like the air wasn't moving at all.
Eventually we arrived in an abandoned warehouse that seemed like it as on the surface even though we had gone nowhere but down. Inside were a bunch of rooms with a bunch of random shit in them, some of it was normal like couches and books, but there were some that had some kind of supernatural aspect to them, like a cuckoo clock that showed one memories from the 1800s.
Oh yeah, I think the guide was my mom and she was taking me there because she had to return a history textbook she borrowed from there, so we had to find the exact room she got it from and put it back in its exact position as last time, which is strange, because its place was just alone on an end table in the corner of a room with the aforementioned clock. Not even a magic book, just a regular old textbook that mom needed to plan a lesson for her class.
As far as I can tell it was a mixture of the Room of Lost Items version of the Room of Requirement from Harry Potter and some kind of SCP. I remember there was an "item" that was just a couch/coffee table combo with a picture of a toddler on it and a permanent imprint on the cushion opposite it. I think the "item" was some kind of feeling of loss of a loved one? The place seemed to hold abstract items like that too.