Over the years, we have seen many caves and caverns, but the Carlsbad Caverns are really something to see. The main self guided tour is 1.25 miles long and reached via a 750 foot drop in an elevator. This Big Room tour includes the Bottomless Pit. Rock of Ages, and Painted Grotto. For those in really great physical shape (we are not), you can skip the elevator and descend thru the natural entrance, but that means doing that 750 feet down or up on your own. This is certainly a bucket list place too see.