My pick would probably have to be Sbeneh Outskirts from Project Reality
[img]http://www.somua.com/forum/uploads/imgs/1395119858__prbf2_022.jpg[/img]
Or Sahrani from ArmA 1
[img]http://img2.wikia.nocookie.net/__cb20130714184809/armedassault/images/d/d1/ArmA_Sahrani_Map_Large.jpg[/img]
[img]http://images.rts-league.org/games/aom/maps/vindlandsaga.png[/img]
Vindlandsaga from Age of Mythology. Every player started on a tiny island with really limited resources but also a transport ship. There was a mainland with plentiful resources, but it would soon turn into a huge, bloody battleground as all of the players scramble for control of its forests and gold mines.
Serious Sam: The Second Encounter: Grand Cathedral
[video=youtube;8jY0g89EFPE]http://www.youtube.com/watch?v=8jY0g89EFPE[/video]
Black Ops II: Hijacked
[video=youtube;XUU1PLKXvNU]http://www.youtube.com/watch?v=XUU1PLKXvNU[/video]
Doom 2: Dead Simple
[video=youtube;oS4ABSL5MhY]http://www.youtube.com/watch?v=oS4ABSL5MhY[/video]
Quake 3/Live: Spillway
[video=youtube;PUwtB5VRAlo]http://www.youtube.com/watch?v=PUwtB5VRAlo[/video]
Quake / DMC: Claustrophobopolis
[video=youtube;2klrwwdveCY]http://www.youtube.com/watch?v=2klrwwdveCY[/video]
[img]http://i.imgur.com/RnxZaa1.jpg[/img]
City Trial from Kirby Air Ride
[IMG]http://img2.wikia.nocookie.net/__cb20090813010927/kirby/en/images/e/ec/Capture45.jpg[/IMG]
Dracula's Castle from Symphony of the Night
[img_thumb]http://1.bp.blogspot.com/_qSoXaKW2Pcw/TRpV9b8pPWI/AAAAAAAAATk/piD72UGH4iU/s0/sotn-castle.png[/img_thumb]
A map so good that it still works even when it's been flipped vertically.
[img]http://2.bp.blogspot.com/-BV7D0Ud3bM8/URA5lNSeitI/AAAAAAAAE0o/j3kj4VlIsQU/s1600/2013-02-04_00001.jpg[/img]
Antichambertoo good
There were a few in the original Zombie Master that were really good. They weren't included with the mod; the server I played on had them, and yeah some only used the Hammer sample textures but they were really fun. I miss that game.
[t]http://images.wikia.com/runescape/images/archive/4/43/20120320153248!Catherby_beach.png[/t]
Catherby beach, from Runescape. It was amazing, back in 2007 (ish) I used to fish there with a friend and there was pretty decent money to be made from grinding the fishing spots
[t]http://www.mafiaweb.unas.cz/Mapa%20Lost%20Heaven.gif[/t]
No joke, I probably know this city better than my own.
Arcadia From Bioshock
[IMG]http://img4.wikia.nocookie.net/__cb20111113061152/bioshock/images/0/01/Arcadia.jpg[/IMG]
Es Preeetty.
[IMG]http://thevitalounge.net/wp-content/uploads/2012/12/2012-12-21-163614.jpg[/IMG]
jet set radioooooooooooo
The Pillars Of Nosgoth - Legacy of Kain
[IMG]http://th06.deviantart.net/fs21/PRE/f/2007/273/8/a/Pillars_of_Nosgoth_by_juliansonne.jpg[/IMG]
I've got too many that i honestly can't think where to start. I'll go for a easy one for now.
[thumb]http://blog.purentonline.com/wp-content/uploads/2011/02/monte-carlo-circuit-monaco-formula-1-grand-prix-picures-05.jpg[/thumb]
Monte-Fucking-Carlo.
Edit: Since i just got reminded of Metal Gear Online...
[thumb]http://www.gameland.ru/post/44023/img/UrbanUltimatum.jpg[/thumb]
Urban Ultimatum, or City Under Siege if you want to go by its original name.
[IMG]http://i1.ytimg.com/vi/HF1G0RyXXxE/0.jpg[/IMG]
Area 6 from StarFox 64
and a bunch of others.
-snip-
[t]http://img3.wikia.nocookie.net/__cb20100224051636/cs_/images/9/9b/De_dust2.jpg[/t]
[t]http://www.asmodis.at/download/dods/dod_orange_s4e_crafty/dod_orange_s4e_crafty3.jpg[/t]
and all variations of this map
Stratholme from WoW:
[t]http://th08.deviantart.net/fs71/PRE/f/2010/006/6/d/The_Burning_City_of_Stratholme_by_Lost_In_Concept.png[/t]
Milkman Conspiracy from Psychonauts:
[t]http://mthec.files.wordpress.com/2009/07/wall05.jpg[/t]
A New Life from Hitman: Blood Money:
[t]http://img4.wikia.nocookie.net/__cb20130328034312/hitman/images/d/d7/A_New_Life_Oversight.png[/t]
Halo, Assault on the control room
[thumb]http://img3.wikia.nocookie.net/__cb20071109022726/halo/images/7/7a/Rep-Installation04_Control_Room_Overview.jpg[/thumb]
[IMG]http://www.sonicretro.org/file/2012/10/sonicgcin4.jpeg[/IMG]
That guitar rhythm.
~1500 games of Dota, this map still doesn't get old.
[T]http://www.devilesk.com/media/images/dota_map_full_compress2.jpg[/T]