The meaning of passage in dream | Dream Interpretation
A sense of being in between* regarding work, love or life; change, as in a rite of passage—so, the movement between stages or phases of life; the back passage, rectum; or front passage, vagina, and so the birth passage. See corridor. Idioms: work one’s passage.
See hall / passages in buildings
To dream of a secret passageway, indicates hidden power and your desire for inner exploration and self-discovery. Something needs to emerge from your unconscious - and when it does, you will discover new opportunities and increase your level of consciousness.
This is really an obstacle dream. the longer the Passage, the greater the difficulties you will overcome.
see Hall/Passages in Buildings