I was traveling between dimensions through portals. Each portal was located in a small house or a cave, where past me used to rest when traveling between dimensions. However, I didn't have any memories about past me. My goal was to get a magical crystal from one of the dimensions and bring it back without being noticed by monsters. The last dimensional portal brought me to the museum of history of the universe.
This dream suggests that you are exploring and seeking out new experiences and opportunities in your life. The portals and different dimensions represent your desire to expand your understanding of the world around you. The fact that you don't remember past versions of yourself may suggest a feeling of detachment from your past decisions and experiences. The magical crystal you seek may symbolize a goal or desire that you have been trying to achieve or acquire, and the need to be cautious not to let obstacles or setbacks interfere with your progress. The museum represents the accumulation of knowledge and history, which could suggest a desire to learn and grow from past experiences. Overall, this dream may be urging you to be adventurous, yet cautious, in your pursuit of personal growth and success.