I live very close to Carlsbad Caverns National Park, and have been through them many times. Even went into the “New” cave once.
Lechugilla cave is closed to normal visitors. Good for the preservation of an incredible resource, but disappointing that so few can see any part of it. I wish they’d come out with a detailed documentary, cause that cave is spectacular.
I’ve also been in the Luray caverns in Virginia…http://www.luraycaverns.com/ None of my film came out that time though. Made a mistake in the dark trying to start the roll of film.