what does it mean to dream of a secret passageway in your uncle's basement?

I had this dream some times where I visit my grand-uncle's house and there is a passageway in his basement. I really want to go in it so I could explore and fine some nice things. I go in the secret passageway, but my uncle said that I'm not allowed to go in because I was invading his private property or something like that. So in the dream, my sister wanted me to go with her to the secret passageway with her but I refuse because I was afraid that I was going to get in trouble with my uncle. Then there was this other passageway where it leads to steps in my uncle's basement and a school was there. I tried to explore the school passageway but the door was locked. Any meaning to this dream? Thanks for anwering.