The cave formations are not as large as many of the other famous one, for example, Colossal Cave or Carlsbad Caverns, but Kartchner Caverns are still "alive", growing formations, and the pathways have been designed to give easy access to about two-thirds of the known area while maintaining the caves as pristinely as possible. Eighty-Five percent of the cavern has not been touched by humans. During the summer months the Big Room is closed to human visitors because mother bats use it to give birth and raise their young until they are able to fly. The bats fly in through the original sinkhole opening. For the tours, a series of airlocks and sprinklers have been installed to maintain the 70-72 degrees Fahrenheit and 98 percent humidity in the cave.
Photography is not allowed in the caves, except on special tours, due to safety concerns for both the formations and people on the tours, so I didn't get any photos inside the caverns. However, there is a beautiful, small desert garden at the entrance to the Visitor Center that supports a variety of wildlife. I was able to photograph three species of butterflies in the garden, including Painted Ladies, Mexican Yellows and a gossamer butterfly species. The Mexican Yellow I uploaded to BugGuide.net is the first of it's kind on the site. Camping is also available on site.