What are they driving to?...

At 25 seconds into the trailer, when we see the expedition driving off, you can see what looks like two manmade (or engineermade) walls left and right, with an opening through the middle to what imediately looks like a hill - BUT could also be seen to be manmade too.... [img]http://garrick.lesniakswann.com/Pro-SHOT_manmade.png[/img] I say the 'walls' look manmade because there are clear 90 degree edges to the left and right edges of both walls. Although the hill in the middle could be just that - a hill - it COULD be a structure too....