In this chapter of Paramahansa Yogananda's Autobiography of a Yogi, his master Sri Yukteswar who was one of the most advanced yogis to bless this earth, comes back from death to give his disciple a comprehensive description of these higher planes.
Autobiography of a Yogi/Chapter 43 - Wikisource
Regardless of your beliefs, I thought it'd be nice to share and have a dialogue about it.
Shanti, Shanti, Shanti