Visiting a spirit world is read as exploring the unconscious, ancestry or deep memory. Dream books see it as a journey into what is felt but not seen.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.