Carlsbad Caverns National Park is famous for the Carlsbad cavern. While Lava Beds National Monument is famous for its labyrinth of caves, Carlsbad is famous primarily for a single huge cave. There are several small caves around that require permits and specialized gear to visit.
I would highly recommend coming here early in the morning. You need to book a reservation in advance. The Carlsbad cave is huge. And while some people take the elevator, I recommend going down as well as up via the hike to have the fullest experience. It takes about 45 mins to hike up/down. And then there is a big room to explore at the bottom. There are ~50 marked stops to the bottom. Expect to spend about 3-4 hours in the cave.
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