So there's a meteor crater outside of Winslow, Arizona. It is a very large hole in the ground.
You aren't allowed to hike to the bottom of the crater for "scientific" reasons, although I would guess in this instance, "scientific" = "liability. So instead, the gift shop has set up a diorama for photo ops, so you can send out pictures of yourself at the "bottom of the meteor crater."
Interpret Matt's expression here:
a) I have made an important scientific discovery at the bottom of this large hole!
b) AAAA! A METEOR!
c) I have paid $30 so that my wife can take a picture of me in front of a picture of rocks!