Riddle: I sound so cool and people all over the world come again and again to see me. Most people spend years with me but you can't be too old or young to come see me, unless you decide to make me part of your career? I am able to make you smarter and wealthier too. What am I?

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.

yes they most likly are and have planed t try to bring human life and supplies there also(due to global warming and other harmful resorces)

the mending wall was written by robert frost