Oh, caves… They are all so similar, and yet very different! After visiting the Mammoth Cave, Wind Cave, Jewel Cave, and Russel Cave units of the National Park Service we have been in some dark underground places! Someday we will cross off the last two park units named after caves – Oregon and Timpanogos Caves! Carlsbad Caverns is its’ own adventure and one we were glad to be able to visit!