The Zohar, Chapter “Tazria (When A Woman Delivers),” Item 20: When the soul descends to the entrance to this world, she first descends to the Garden of Eden of the earth, and sees the glory of the spirits of righteous standing column by column. Afterwards, she goes to hell and sees the wicked crying “Alas! Alas!” and no one pities them. She is given testimony of everything: the wicked testify how they are punished for each sin, and the righteous testify to the good reward that they receive for each Mitzva [good deed, commandment]. And that holy image stands over her until she leaves toward this world.
The Zohar always speaks about one soul, one man. Whether it speaks of the Garden of Eden and hell, or the righteous and the wicked – all of them are included in one man.
When we enter the system of our soul, we become submerged in our inner reality and in examining all of the possibilities there. This is what is meant by travel between the Garden of Eden and hell, and to observe what is happening there. In other words we create a map containing the route of our spiritual advancement.