((Not exactly Lost.
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When you enter a ruin or dungeon, you can correctly ascertain its original purpose and determine its builders, whether those were dwarves, elves, humans, yuan-ti, or some other known race. In addition, you can determine the monetary value of art objects more than a century old.
I have been describing things as you go indicating there was a collaboration of races that built it.
Everyone knows this was library.
That said:))
It strikes Joe as being odd that she hasn't heard about whatever this place was before. Not even a mention. It's not
that old, couple thousand years tops, and must have been big.