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Carlsbad Caverns
The park's most famous cave, Carlsbad Cavern, is over 1,000 feet deep and currently contains 30 miles of mapped passages. The Big Room of Carlsbad Cavern is the largest underground chamber in the United States. View formations of stalagmites, stalactites, and columns in this video. You will also see the evening flight of Mexican free-tailed bats from the entrance of the Cavern.

The Cicada
That humming, buzzing chorus of insects heard on summer nights is usually due to cicadas -- small, stout-bodied, large-headed insects with sucking mouth parts. Take a look at one up close and listen for yourself to their singing.