The largest of them is aptly named the Big Room.
One of the most popular activities for visitors is to write and send postcards from underground.
The lunchroom and the meals it serves, however, is drastically changing the cave eco-system.
The smell of food has lured hundreds of non-native raccoons, skunks and ringtail cats into the cave.
Additionally, the lunchroom lies on a bat flyway.
Photo credit
Photo credit: Carlsbad Caverns NP Historic Photos
Sources:NYTimes,Carlsbad Caverns Trading Company,Wikipedia
