This is a portion of the way to visit one of the cliff dwellings at Mesa Verde. You have to negotiate two ladders, scores of stairs, crawl through a rock tunnel and wind your way through this rock crevice all the while being reminded that the natives that created this had none of your advantages and children as young as three did it on their own. Impressive feat. And totally worth the effort today to get into this complex of rooms and kivas and realize it was abandoned nearly 1000 years ago. Easy to see why T Roosevelt named this a National Park in 1906.
Mesa Verde National Park