I've always been fascinated by the idea of the Abyss. With its infinite layers of cold, hot, undead, fiends, you name it, it's there. For higher level adventures it opens up a vast realm of possibilities. This is the first of a series on the Abyss, but it also connects to the Savage Tide adventure path in the adventure "Wells of Darkness" from Dungeon Magazine #148.
"The first layer of the Abyss is known by many names, the Plain of Infinite Portals and the Palace of 1,001 Closets being but the most common after its proper title, Pazunia." - Fiendish Codex I: Hordes of the Abyss, p. 113.
High Resolution, DM and clean versions of all of the maps related to the "Wells of Darkness" adventure can be found here: https://www.patreon.com/posts/wells-of-high-113086416