I recently came across the info that Sufis have their own form of journeying, to the realm of "Alam al-Mithal".
Henry Corbin, an academic, has written books and articles about this form of journeying.
What is a good practice guide for this type of journeying?, for someone who is not new to journeying in general but is not familiar with this Sufi journeying practice (and has no access to a Sufi teacher either) ?