For an authentic GGG lader site, I recommend the tour put on by the Ute Mountain Tribe in Utah/Colorado. They escort you to several of the Anasazi pueblos on their reservation that are tucked in the side of mesas a little south and west of Mesa Verde
The ladder climbs are pretty exciting and after two, a third was far beyond my wife's comfort level. The dread of the return was beyond her capacity.
The ladders are made from local shaved poles and to my eye meet OSHA specs for size and cleated rungs.
The Anasazi had some ladders that were very high and consisted of notches in a log. Imagine the thrill fo being on such a ladder 20 feet up with a sheer cliff 300 0r 400 beneath the base of the ladder.
I haven't been to that one yet. I'm not a big fan of heights--dunno how I worked on some archaeology surveys, walking near cliff edges with 500 ft drops.
Ever seen Jackson's staircase at Chaco? My friend in the BLM tells me there are some amazing dwellings in Grand Gulch, Utah. I had to settle for pictures.