I am playing Unreal Tournament and analysing the maps to see what I think is the best to recreate.
The map in this screenshot is DM-Agony
In this screenshot you are introduced to some interesting scenery.
The scenery tells you that you are underground in some type of dungeon. The lantern indicate that you area in the older time. Straight away there is a weapon in front of you, which allows one of your team to get a head-start, which encourages teamwork, because to survive you need to team up.
The scenery in this screenshot hints more at where you are, which I believe is a type of mine.