Most definitely Abbatoir][ in Tac Ops.
Tac ops had plenty of fantastic maps.

I haven't played in a long while, but definately UT Facing Towers (I think that's what it's called, if not, that's pretty much what it is).
All time greatest fun I ever had especially with low gravity, instagib. Nothing has ever been more fun (in my opinion.)

fy_snow for CS

ww2 recon conversion for Myth2: Soulblighter

dod_avalanch

best map evar

CS: fy_pool_day, cs_mini_militia_v2, de_dust2,

DOD: dod_avalanche, dod_caen

Wolf ET: oasis

JK2: Bespin Streets

Quake: dm3

I just thought of this. No one has mentioned any Tribes maps. Wow, Broadside and uhh, hmm, I forgot the other name, had a tower that either team could control in the center...anywho, those were great great maps for a great great game. It's a shame Tribes 2 couldn't match up. I guess the same goes for Q3 compared to Q2.

peaks in raven shield

nothing but snow a few hills and some trees

cs_assault, cs_militia my favorite CS maps
q2dm1 was awesome [Quake 2]
2fort and well for TFC

N64 - James Bond: GoldenEye - Temple
infinite replay value

Waldo World Arena and Beyond Thunderdome.

Marathon series. The only remaining redeeming feature in the history of Macintosh gaming.

The Edge
 

Quake II - The Edge (Q2DM1)

I will never in my life again spent so much time in some brown gibbish map that made so much fun and was played so often in all clanwars that i particpaed in !

I can't remember the exact map name, but it was Team Fortress for Quake. The map had two big rooms seperated by an entrance between them. It was closed for like 30-60 seconds so you could build sentry guns and stuff... then the doors opened up and each team went at the other's neck. Oh, the memories of carnage...

Q2DM1. It was so well done. Lot of fun to play on that map. It's the only maps I still sometimes play on with bots.

The complex in GoldenEye. Great great many deaths occurred in that arena

2fort and openfire_l for TFC

There was this user-made map for Unreal once called "Zeitgeist" and it was the best, most ingrossing urban map I've ever played on. A real masterpiece.

de_inferno in Counter-Strike. It seems so simple, but nooooooooooooooooo, it isn't.

ctf-orbital2 from UT2003

dm-tempest from UT

and Tokays towers from Q2 w/ lithium

killhouse 2 story inn rainbow six

de_dust, de_dust2, de_aztec and scoutzknivez because i own it up with the scout

dod_caen
dod_avalanch
dod_flash
dod_forest

I really liked Hang'em High in Halo. Get my hands on a pistol and a shotgun on that map and I'm unstoppable.

omg dod_avalanche.. pure genius.
Takes the real Valve guys to make something this good, and I'm glad they chipped on.
Truely a work of art, visuals match gameplay.

Same story for the Valve maps on CS, they are VERY well done.
Chateau, Piranesi (Dont really like the Havana one.. too dark or something)
But, I think they have too many routes, and the average CS player can't handle too much thought at once, so they werent very popular with the community. :crazy:

Theres a one official Q3 map that I love also, lots of levels and the flow is great. Cant remember the name though.

Being a mapper myself though, I feel this thread is pretty 'open' as you didnt really specify what makes a 'best map' be it looks, or gameplay, or both, etc.

de_dust2 ( i liked it better than dust because it had more ways to go everywhere rather then 2 )

hmm..

dam for goldeneye was good too, you could get sniper rifle and own it up

Definitely mp_beach for RTCW

The Edge is indeed the shit, but I enjoyed Tokay's Tower just as much.

One of the Perfect Dark maps.

q3dm17... I don't even know why I bought the full game, this map was in the demo...

dm3, the best map for 4v4 in Q1.

DooM - Arena (Pretty sure that is the name)

You all know this is the best map ever!

Complex in Goldeneye. Ah the crows nest with proxy mines on..classic gaming

de_dust!

i dont remember the name of hte map in Quake 1, but it was the one with the vacuum tubes thingies. it's been a long time, but i remember being in awe of that level

Duke Nukem 3D- "Red Light District"

2fort4, therock, the well one, asylum and some other TF and action quake2 ones...

some one did mention them, and they also remade the classic maps for T2, for some old school fun :D.

My favorite tribes map was Dropzone 2, played on renegades.

the stalingrad map in MOH is one of my favorites

battlefield1942 - el alamein is my favorite

CS: cs_bakke! A little creation from a friend of mine :D

DoD: dod_avalanch or dod_hill

De_dust and fy_iceworld are both quality. Then there is Blood Gulch for Halo and Mp_Beach in RTCW. Can't think of too many more but UT2k3 had some really beautiful map designs too.