Mt. EverestThis is an idea that's been tossed around a lot, but not pursued. But it definitely should be. There are ton of ways to go about this. Personally, I think the best way to do it would to be make it a conquest-style map, where everyone starts from their own base camp and has to work their way up. There would be checkpoints along the way where you could set your camp and have an auto-deploy on them, negative bonuses for some specific places, and of course decay from the ice freeze on open areas where obviously it's really cold, and the air is very thin.
I envision a town at the bottom of the map, then base camps at the very bottom of the mountain itself. Ropes would link territories where icons would specify the bonus of the area — for example, a campfire would be a +1 bonus autodeploy as a resting point, a tent a +2 autodeploy for a mountain camp, an avalanche symbolizing a killer neutral area, and the like. The map would be organized as a giant funnel to the summit, but obviously there would be branches going off to different areas.
I'll throw up a really rough map just to show what I think it should look like later.

If someone would like to do graphics (preferably experienced?) ask away …
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