This might be an obvious one, but you can use rock archs to create caves. Especially with the new possibilities for FPS-play inside maps, this should prove useful in many a map.
Edit: Heck, you can create some pretty interesting alcoves this way. All this needs is some lightning to set the mood and it's ready to go.
I used that idea for a tunnel in my map, hadn't thought of doing that before, so thanks. =)
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I used that idea for a tunnel in my map, hadn't thought of doing that before, so thanks. =)