This map is different from most other maps in that the player progresses differently through the map depending on the skill level. Each skill level "starts" the map at a different location, and some of the traps are skill-level specific. Additionally, the keys and weapons are at different locations for the different skill levels, and there are some areas that are only accessible to specific skill levels.
Gomorrah is a GZDoom mapset consisting of 6 brand-new maps, powered by ukiro's amazing OTEX texture set. In Gomorrah, you'll be traversing three different locations - an abandoned mine/techbase, a medieval castle and a fortress in Hell - in search of three skull keys. Each skull key is going to be locked behind a puzzle which you'll have to solve. Once you have all three of them, you must use them to open a gate beyond which lies your final challenge.
5-level hub, set in a variety of environments. You start in a command center, but explore medieval and techno-medieval areas as you uncover the secrets of the Temple of the Ancients.
A big level, the secret lab is a level by itself. You are instructed to destroy this enemy complex but there is a rumor that their notorious secret lab is hidden here so you cross your fingers and enter the complex. May God help you to find this lab and destroy it.
Sprawling techbase exploration focused dungeon crawl with mostly low intensity combat (though there are a few set piece battles). This map was finished in 2007, but I hadn't released it because it was supposed to be part of a mini-episode that was never finished.
Prayers of Armageddon is a Doom II megawad created by Santtu Pesonen (MFG38). It includes 32 new maps and a hidden bonus map which is only accessible via using cheats. All the levels for the megawad were created entirely by Pesonen.
There was also a remake titled Prayers of Armageddon: Retaliation, and it was released in 2014.
Hanging Gardens is a single-level PK3 for Doom II and the GZDoom source port that came out in August 2011. It was designed by Paul DeBruyne (skillsaw) and uses a music track from Epic Pinball. It's set in a lush, walled garden in the middle of a desert.