might as well add my two cents worth here, because why not.
In order of my favourites
1) Dixmore Asylum - SevingPLuke (or something along those lines)

Possibly the most fun i have ever had in a Custom Zombies map from the perfectly ported weapons, including my Favourites, the Sexy Mexicutioner and the Iron-Sighted DSR-50. The button easter egg was extremely fun as it changed everytime and the reward was definitely worthwhile.

2) Beach House - Jei6963

This was my first ever zombies map that I played back in 2012, it was running an early version if the UGX mod, and I loved the Buildable boat ending, as well as the steps to get PAP.

3) Swamp of the Doomed Ones - HitmanVere (SplitHamVere)

What can I say, I have a soft spot for maps like this. I loved the Springfield Sniper Rifle you could get as it was the first time the Springfield was properly good. Plus, it changed up from the standard Der Riese to the lesser used Shi No Numa theme, which worked a treat.

4) Collingwood Psychiatric Hospital - Chromastone10

This map was the first map I ever had a solid Grind on, as I still have the record for the earliest time completable on the map, as well as my highest round in zombies ever, which is 46/7 (somewhere up there). This was the first I played that hap proper ports of everything, anims, models, etc. The Boss was also a good addition, as I personally never got high enough to take on the Engineer in Dead Ops Arcade.

Honourable mention/s
Encampment - ProRevenge
Hotel V2 - HitmanVere
Library - Jzob123

Oh! I want to participate. I've never written anything in this board but I'm just bored.

I haven't played many maps so maybe I'm missing some really good ones but here are my favourites:
 - Leviathan. I spent many hours trying to do the easter egg (solo ) and it also was one of the first maps I've ever  played and I was amazed to see a map like that in WaW: underwater, a guy inside a pipe speaking to me, the excavators...

 - Collingwood Psychiatric Hospital (CPH). I have to admit I was really frightened while I was playing this map and maybe this is what I like of this map. Also I remember having some little heart attacks when the fat guy started shouting.

 - Estate of the Dead. It was a really fun map and I enjoyed almost every minute I was playing it.

 - Christmas Warehouse. Basically I loved the idea of those three quests, even though I could never finish the map because it was impossible for me to finish one of them.

I've played other really good maps but, since I'm one of the worst zombie players, I get frustrated when they're a bit difficult for me.

And, of course, CUBE, but it was so good that I couldn't have compared it with the rest of the maps. Also it's not finished yet.
Just kidding.

There are a lot of maps that I love, but these are ones I find myself coming back to over and over again.

4) Berlin Bank - The first map I ever saw that implemented the “zombie flood”. Seeing like 15 zombies come sprinting at you and hurdling a desk is pretty freaky and exciting at the same time.
3) Kino the Rebirth - The Blops Kino was the first zombie map I ever played and this is just an amazing remake of that.
2) Nacht der Toten Walder - Made by one guy. At the time I never thought a custom map could look this good and very few look this good even now.
1) UGX Requiem - Seeing where this map came from to what it became, it's magic, this map is freakin' magic.

No particular order...

UGX Requiem - So detailed and so enjoyable, such a satisfying map, a 10/10 job by the UGX Team. Easter egg was amazing, as was the new custom features v1.1 brought to the UGX mod. Worth the wait. Definitely.

Oil Rig - Although hard, Stevie did incredible detail on this map and it's feels like a DLC. Intense, but so many aspects ported perfectly, from guns to perks, Stevie did a stunning job.

Nacht Reimagined - My first custom map and it was amazing to see the first zombie map we received in a new light. The map is amazing and is relatively calm if you get a decent gun.

Kino the Rebirth - This map was incredible considering it was built on an engine that enjoys grey yet this has given an incredible fresh look to Kino which really fits with the weaponry. Amazing job and many cool aspects to it.

Had to put 5... Lol

Leviathan - Although a very hard map to play, the effort put into this is shown by how it could've been in the DLC 4 instead of Moon and people would've seen it as Treyarch-grade. Amazing use of the Black Ops mod and it was incredible to see the PES suits and Excavators implemented to custom zombies. Insane, yet exquisite map.

This was extremely hard to decide, Dixmor and Collingwood were considered, there's so many great custom maps now it's hard to pick the best ones out.

1. Leviathan

2. Sumpf 3.0

3. Comosea

4. Estate of the dead/ Requiem

I put mine from favorite to least favorite

1. Dead Ship

2. Leviathan

3.Berlin Bank

4.Cheese Cube Unlimited

4 town remake
3 project viking
2 highjacked
1 highrise

My favs are in order

1. Best Map Ever Xmas Edition - by NGcaudle

2. Best Map Ever remastered - by NGcaudle

3. Best Map Ever - by NGcaudle

4. Better Than Best Map Ever - by NGcaudle

I think the guy who made these maps should get mapper rank.

My favs are in order

1. Best Map Ever Xmas Edition - by NGcaudle

2. Best Map Ever remastered - by NGcaudle

3. Best Map Ever - by NGcaudle

4. Better Than Best Map Ever - by NGcaudle

I think the guy who made these maps should get mapper rank.

smh ^

(Image removed from quote.)

how about yes? they're an amazing map maker. one of the best on this site. their chill, smart, funny, and hawt

My favs are in order

1. Best Map Ever Xmas Edition - by NGcaudle

2. Best Map Ever remastered - by NGcaudle

3. Best Map Ever - by NGcaudle

4. Better Than Best Map Ever - by NGcaudle

I think the guy who made these maps should get mapper rank.

Surely 'Better Than Best Map Ever' should, at the very least, be above 'Best Map Ever' in your list?

My favs are in order

1. Best Map Ever Xmas Edition - by NGcaudle

2. Best Map Ever remastered - by NGcaudle

3. Best Map Ever - by NGcaudle

4. Better Than Best Map Ever - by NGcaudle

I think the guy who made these maps should get mapper rank.

If you want mapper status dip your PC in water, observe the sparks and delete CoD WaW.

My favs are in order

1. Best Map Ever Xmas Edition - by NGcaudle

2. Best Map Ever remastered - by NGcaudle

3. Best Map Ever - by NGcaudle

4. Better Than Best Map Ever - by NGcaudle

I think the guy who made these maps should get mapper rank.

Tsk tsk, one does not simply get mapper rank, you must first offer your flesh to ugx and sell your soul to trem to show how much of a man you are!

How has Neighborhood not made it in anyone's top 5!?????!??

Because of the totally annoying parkour and absurd buyable ending, but other than that, I agree, it's a great map. Would have made my top 10 for sure.