I love caves. This one is different from the caves in the southern states. Niagara is very deep and sometimes very narrow. Lots of stairs. Everyone was winded when they reached the entrance again. The most interesting thing about this cave is that the fractures that you walk through have dozens of feet of air above you. At one point the guide told us that even though the passage opening was only 5 feet wide, it extended up 150 feet above our heads. There was a "river" running through the cave. Few formations--not at all like the limestone caverns covered with sparkling crystals--but definitely worth seeing.