All-around map. You decide if you want to travel indoors, scavanging for enemies or run in the streets and provide good cover-fire. Sounds familiar? Well, you're right, in Call of Duty 4 the makers decided to remake the very popular Carantan map from Call of Duty 2. Any online mode works well here, but I find Big-Team games excell. You can either start out in a grassy area on one side of the map with a helpful machine-gun mounted nearby or you can spawn on the other side, houses and buildings surrounding you, waiting for the enemy to pop up.
You really feel like you're in China Town, i find this to be one, if not the best detailed map out there.
You can use pretty much any gun here, from an Uzi to a Barett, everything works.