The Bunker, a medium sized map with lots of thought and work put into it.
(Gametype here: CQB)

One of the Main spawns in The Bunker, there is another just like it in the other base.

On the left shelf(door) lies two magnums, an SMG, and later in the game, an assault rifle will spawn next to it. On the right shelf lies a spiker, a plasma rifle, and two plasma pistols. On the floor, there are two frag grenades, two plasma grenades that spawn a minute later into the game, and two spike grenades that spawn at the same time as the plasma grenades. There is also a Power Drain, which spawns every minute(starts at beginning); a deployable cover, which spawns two minutes into the game; and a bubble shield, which spawns three minutes into the game. In the fence box, there is a sniper(spawns every three minutes and only has 1 spare clip) and a teleporter leading to a sniper post above the courtyard. To the left of the room is a path leading directly to the courtyard as well. (due to my SDTV, I couldn't fit it into the picture)

Tip: You can also shoot at the courtyard and the other base's fence box through the fence as well.

http://img214.imageshack.us/img214/3844/thebunker1bb6.jpg
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Where the flag spawns in The Bunker. Also in both bases, although there are slight differences in the actual room.

A regenerator spawns on the floor every minute. A battle rifle also spawns on the floor every 30 seconds. The box serves as a safe respawn area and a hiding spot to catch someone trying to get the flag by surprise. There is a path leading out of the room to the right.

Tip: The br doesn't have much use beyond the courtyard, as most weapons when used right will outgun it at any other range.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=63641971&fset=34549
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Where the bomb spawn and plant points are in Assault. It is also the same in the other base, except that the other base has a turret that is in asymmetric gametypes only and doesn't respawn.

The hall leading from the flag room and main spawn room to the courtyard. It has a shield door protecting the entrance. You can also spawn inside of the hall.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=63642185&fset=34549
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The middle of the map and part of the courtyard.

Tip: you can hide on the A sign and drop down to assassinate someone when they carelessly walk under it.

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The sniper post above the courtyard. get to it by entering your main spawn's teleporter.

A two way teleporter leads to and from the sniper post. there is a wall separating each base's sniper post. the fence wall can be shot through, so there isn't much cover except for by the teleporter. (Couldn't be put into the picture because of SDTV)

Tip: There is a br in the flag room that can also be used effectively from the post.

Tip 2: You can also drop down from the post and get directly to the courtyard.

Tip 3: If the sniper is shooting at you, you can flush him out with a grenade or shoot back at him through the fence.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=63642475&fset=34549
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Away from the courtyard are some spawn points, weapons, and cover. It also serves as the starting point for the zombies in infection.

A plasma pistol and a magnum sit behind the dumpsters and fence wall. In the left room is a spawn and a spiker and magnum. to the right is a spawn, a plasma rifle and frag grenade, and in Infection is the starting point for the zombies. On the middle dumpster, a Shotgun with no spare clips spawns every 3 minutes. This serves as the power weapon of the map.

Tip: If anyone tries to camp behind the shield door or in either of the small rooms, flush them out by throwing a grenade over the shield wall.

Tip 2: Try to get that shotgun before the other team/any enemies. if you're lucky and don't get killed, it can mean 8 free kills for you or your team.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=63642820&fset=34549
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The courtyard. It is the most open area of the map and will most likely be where the most conflicts happen.

In the courtyard, there is an entrance and exit from both major spawns, a sniper post above, a fusion coil over to the right, a spiker and frag grenade to the left of the bridge, and an SMG and frag grenade to the right of the bridge.

Tip: Watch out for the sniper posts, as you might get sniped or killed if you are too careless.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=63654331&fset=34549
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Hope you enjoy it, as I spent lots of time working on and testing it. Hell, I spent lots of time taking the pics and typing all of that.