Map Link: Temple of Doom
Gametype Link: None, this map supports all variants as far as I can tell.
Suggested Gametype Variants: One Bomb, Single Flag, Infection, Territories

Welcome to the Temple of Doom, version 2.0. This map should work (well) for any gametypes. My favorites are CTF, Assault, and Infection. It was designed with asymmetrical games in mind, but should work pretty well with symmetric maps as well. As the attackers, you first have to pass through either of two symmetric trenches. Then things get interesting. Here you have your choice of going through the top or bottom passageways into the defensive base. But there's a spinning spool of death that can catch you either way if you're unprepared. At the end of both passages, there's a dumpster, which will block one of them, depending on the existence of a grav lift. Both teams can destroy it, and both teams have a portable grav lift to lift it back up if need be. Once the defender's base has been infiltrated, the attackers can go off to the side to open up an extra entrance by destroying a protected grav-lift. Finally, in the base, there's a dumpster which can be dropped onto the objective point and down the stairs by the defensive team to mash any intruders.

The screenshots are below and should be a fairly in-depth overview of the map. Please DL and have fun with it... It's the first map where I've had real fun playing 1 v. 1 and 1 v. 2 objective games. If you have any comments or suggestions (especially with spawn/weapon placement), please leave them below. I think this map is pretty balanced (favoring the defenders a little bit more at the beginning of a round). And again, this should work for all gametypes. After some more playtesting, I may make some custom variants for use with the map. For now, though, use your imagination. This took a lot of hours to playtest and get the kinks out, so have fun!

Updates:

Essentially, version 1.0 favored the defending team way too much and it was impossible to get into the base. I did the following to correct that:

1) Dumpster door and dumpster drop tweaked so that they work 99% of the time, rather than 90% of the time... feel free to abuse them.
2) Added a third entrance to the defender's base which can only be opened from the defender's side. (grav lift behind a shield door, like in the Citadel)
3) Completely revamped spawn points so that they don't suck.
4) Did a better job of closing off the map.
5) Added a spawning tunnel in the defender's base.
6) Added bunkers to the attacker's trenches complete with defensive equipment.
7) Moved weapon placements to better balance the map. (no more sword, sniper closer to attackers, etc etc)
8) Redid objective points for better gameplay.
9) Grenades toned down for both teams, especially the defenders.

Shut Out
Probably the most effective and active defense available in the map, this 'dumpster door is set to move up and down depending on the existence of a grav lift below it. The grav lift is easy to destroy, to block off the bottom passage. But both teams have access to deployable grav lifts to lift it back up and block the top passage. Attackers have a clear shot at the lift from the bottom passageway, but will have a difficult time getting rid of it from the top (think fire and spikes)
[img width=600]http://img227.imageshack.us/img227/2713/shutoutcv8.jpg

Door
Here's the door from the defender's side. The weapon holders function as a 'sleeve' for the dumpster. Note that the defenders can see into the top passageway from their base. Also note the addition of a third entrance on the top left.
[img width=600]http://img99.imageshack.us/img99/7799/entranceaa4.jpg

Your Choice...
New in version 2.0, you can pick your way into the base from the top... so long as you've destroyed that grav lift from the inside first.
[img width=600]http://img232.imageshack.us/img232/2460/pickqf2.jpg

Indiana Jonesed
Here's another little tool the defenders (and the attackers, if the defenders aren't playing attention) can use to mash up their enemies: the falling dumpster of doom (kinda like the rock in those Indiana Jones Movies). It works particularly well in objective games, since the attacker's goal is generally right underneath it. It can be set off in a number of ways. A good grenade will give you the fastest results, while shooting the fusion coil is slower (both the coil and a propane tank have to blow up to set off the drop). Sometimes kills in 1 hit, usually just hurts really bad.
[img width=600]http://img225.imageshack.us/img225/2494/indianajonesedam4.jpg

You Got Spooled!
Here's the third and final gimmick of this map: The spinning spool of doom. This little baby whips around both the top and bottom passage in a circle, killing or severely injuring anyone who isn't patient when crossing the danger zone. This adds a sense of danger to getting the power weapons: a sniper up top and a shotgun down bottom.
[img width=600]http://img225.imageshack.us/img225/4956/spooledgy5.jpg

Spool Trap(Top)
Here's another view of the spool trap.
[img width=600]http://img227.imageshack.us/img227/3565/traptoplg2.jpg

Defensive Base 1
Here's a high shot of the defender's base. Note that there's no longer a shotgun in the box behind the staircase. That tunnel in the back is where the defenders come out if you're in the base. Watch out!
[img width=600]http://img232.imageshack.us/img232/7550/defje1.jpg

Defensive Base 2
And another angle.
[img width=600]http://img227.imageshack.us/img227/9002/defense2wh3.jpg

Attacker Base 1
Here's the Attacker's base. It's pretty simple, as this map was designed mostly for asymmetric games. The map is pretty balanced for 2-way games, too, though, especially with the new defensive barriers.
[img width=600]http://img99.imageshack.us/img99/707/atkie8.jpg

Attacker Trench
This is the view as the attackers exit their base. There's another one on the opposite side. Now there are protective bunkers to hide/spawn in, each with a spike grenade and defensive equipment piece. This one has a bubble shield. The other: a regenerator.
[img width=600]http://img99.imageshack.us/img99/6295/trenchbz5.jpg

Attack Bottom
Here's the attacker-side view of the bottom passage. THE SWORD IS NOW A SHOTGUN... just so you know.
[img width=600]http://img225.imageshack.us/img225/3466/atkbottommg9.jpg

Attack Top
And the top passage into the defender's base.
[img width=600]http://img225.imageshack.us/img225/7700/atktoptv5.jpg

Tight Spaces
This map makes for some crazy close calls in the passageways between bases. Avoid these by making the dumpster door do your bidding.
[img width=600]http://img134.imageshack.us/img134/5294/tightspacesfs0.jpg

Finally, I'd like to thank my roommate and fellow playtester, Derek. He hates Halo, so if I can make a map that he has fun on, I know I've done my job.