Bridger's Oneironautic Expeditions

I'm in Iceland getting a ticket to view some kind of large fossil bed in the ground. The whole area is next to a volcano and everything is covered in snow. After entering, I walk around the side and find a deep, perfectly rectangular hole going down about 50 feet. My girlfriend comes up and asks if I'd like to go see the movie they're putting on inside another building. I say yes and follow her inside.