One of my most frequent recurring dreams: I suddenly discover a series of rooms in my house that I've never seen before, and am overtaken by a sense of simultaneous frustration (why didn't I know these rooms were here all this time?!), excitement (new rooms!) and anxiety (what will I do with all these rooms?!). Apparently dreams like this symbolize that the dreamer is discovering untapped potential, or moving beyond what they previously saw as their limitations.
To me, they've always felt slightly more literal.