If you want more context for Machu Picchu, Alan Covey's "The Inka empire" (In Handbook of South American Archaeology, Silverman, Helaine and William H. Isbell, eds. Pp. 809-830. New York: Springer. 2008) is a good, concise overview. The essays in The Inka Empire: A Multidisciplinary Approach, edited by Izumi Shimada (Austin: University of Texas Press, 2015) provide up-to-date overviews of most aspects of Inka archaeology and history.

Michael Wood's Conquistadors (Berkeley: University of California Press, 2000) is a very readable account of the Spanish invasion of Tawantinsuyu (and of the Aztec empire). For a much, much more detailed historical account, see John Hemming, The Conquest of the Incas (New York: Harcourt, 1970).

Jorge Flores Ochoa, "Contemporary significance of Machu Picchu" (In Machu Picchu: Unveiling the Mystery of the Incas, Burger, Richard and Lucy Salazar (eds.), pp. 108-123. New Haven: Yale University Press. 2004), considers the various ways in which the importance of Machu Picchu extends beyond its economic impact to affect social, ceremonial, and symbolic dimensions of the lives of Peruvians today. Are there comparable monuments in the United States?

Richard Burger, "Scientific insights into daily life at Machu Picchu" (In Machu Picchu: Unveiling the Mystery of the Incas, Burger, Richard and Lucy Salazar (eds.), pp. 85-106. New Haven: Yale University Press. 2004) summarizes the implications of a variety of analyses bearing on

health, diet, and likely places of origin of the people living at Machu Picchu
metal tools, techniques, and sources of raw materials
sources of obsidian
engineering aspects of the construction of the site
astronomical alignments

Richard Burger et al., "Rite and crop in the Inca state revisited: an isotopic perspective from Machu Picchu and beyond" (In The 1912 Yale Peruvian Scientific Expedition Collections from Machu Picchu: Human and Animal Remains, vol. 85, edited by R.L. Burger and L.C. Salazar, pp. 119-137. Yale University Publications in Anthropology, New Haven. 2003) reports on the analysis of bone chemistry from Machu Picchu indicating that maize, previously valued largely for its use in fermented chicha drinks, became much more important to Andean diets in Inka times.

Bethany Turner et al., "Insights into immigration and social class at Machu Picchu, Peru based on oxygen, strontium, and lead isotopic analysis," (Journal of Archaeological Science 36:317–332. 2009) provides additoinal bone chemistry data from Machu Picchu that suggests the presence of yana and accla workers.

John Verano, "Human skeletal remains from Machu Picchu: A reexamination of the Yale Peabody Museum’s collections." In The 1912 Yale Peruvian Scientific Expedition Collections from Machu Picchu: Human and Animal Remains, vol. 85, edited by R.L. Burger and L.C. Salazar, pp. 65-117 and Appendix A. Yale University Publications in Anthropology, New Haven. 2003), is a detailed anatomical analysis of skeletal remains from Machu Picchu. Cranial modification is consistent with bone chemistry indicating that the residents of Machu Picchu were not local but came from several distant parts of the empire.