They have specialists that are able to walk you through a number of places that are normally off-limits to other visitors. These insider people are those who work with A&K alone, providing the inside tours for these areas that you need and want. One example of this insider type of tour is seeing Machu Picchu under the help of a former resident who stayed there. He was a former archaeologist that provides an elegant train ride, and more information than you can possibly ask for.