The staff was very polite when we arrived. They did not want us to take the tour. Why? because 3 of our family group have visual impairments. But we said we could handle it and it was wonderful, a high point on our western trip. Having done the tour, we can understand why the staff would be so careful about who could participate. Most of the way is single file, and there is no way anyone can leave without needing a guide. So the staff uses their best judgement as to who can or cannot do the tour. Since there is a railing all the way through, it was a very blind-friendly environment. My wife, who is totally blind, had not problem avoiding getting her head bonked on the low ceilings. But to get to the main point ... this is a wonderful place with unique and dazzling formations, both to see, and to hear described by the skilled staff. The thin formations "bacon" and "angel wings" are things I remember from visiting as a kid 45 years ago. Highly recommended.