For a great autumn experience, join up in an exploration of an underground cave. Carlsbad Caverns descend to down a quarter of a mile, one of the deepest limestone caves in the U.S. The humorist Will Rogers named it “the Grand Canyon with a roof over it.”

Tours are available for every skill level, from expert spelunker to ranger escorted. Be sure to be at the entrance at sunset with your camera when thousands of Brazilian free-tailed bats fly out to seek delicious desert bugs. For more info, go to www.nps.gov/cave