When I did the Marvel Cave tour as a kid, I remember having a group picture taken before we went into the cave. My parents told me they did that to make sure no one snuck off during the tour or fell into an undiscovered abyss. It scared the crap out of me. There was a girl with a huge pink mohawk in the picture and I thought, "Whoa, no one will lose her!" When I went last year they didn't take the group picture but they did have a photographer in the cathedral room to take souvenir pictures. I guess all these years my parents were lying to me about keeping track of people and those group pictures were just for souvenir's sake. Hmph.