Tricky

I was under a spell, As I walked through those golden walls, Under this majestic entrance, I uncovered this palace; I discovered library stairs... Curious! Was my guilty pleasure, As I climb those stairs, There is a little portal, Still curious! I open it, See! What's behind it, What gift I may see... On those mountains... Under this giant palace. You won't believe me... When I declare: The moment you open that tiny entrance, You are not in the mountains anymore! Is it another universe? Another earth... Or life? Probably another galaxy... I guess! have time to investigate... To decode those continuous puzzles... Of my tricky pilgrimage!