Thanks for posting these. I have such fond memories of Carlsbad Caverns. In the past, you could only go with a group tour and when you got to one portion of the caverns, they'd turn out the lights and everyone would sing - I think it was "Amazing Grace" - it was a long time ago! Talk about DARK. You literally couldn't see ANYTHING.
And then, as kids, we really loved the boxed lunches when you got to the bottom.
(Just have to share this story about my brother and Carlsbad Caverns: once, when we went he kept mentioning that is sure did seem darker than what he remembered - and then he realized he still had his sunglasses on.
And the same brother, another time mentioned quite a few times that he wished he hadn't had that "Big Gulp" drink before entering the caverns. As you can imagine, there are no facilities until you reach the bottom. Maybe you had to be there, but he keeps us laughing.)
I agree that everyone should try to make it down to Carlsbad Caverns. I think the photos turned out great.