Welcome to Carlsbad Caverns National Park. If you have a Golden Age Passport, (if you're 60+) then you can get in free. A valuable perk for us old folks! The park is well maintained as one might suspect and the park personnel were as professional as any I've seen anywhere.
The cave itself is awsome! You'd just have to see it to appreciate what you're looking at. I have a few pictures of the entrance but couldn't get any good ones inside the