The pre-Hispanic City of Cacaxtla is one of the most representative examples of the creative genius of the societies that formed the great cultural region denominated by Paul Kirchhoff in 1943, as Mesoamerica. The neglect of the time, - as assumed alteration of built assets -archaeological explorations, as well as the use of atavistic conservation techniques, which were not always employed materials suitable for-, made necessary an intervention that would return stability and balance to the so-called great basement of Cacaxtla. This book comprises a present account of such meticulous work which with the help of various specialists, headed by Dr. Laura Ledesma Gallegos, has as its main objective, based on the use of pre-Hispanic metrology and the geometry, as well as the use of factory materials, to ensure the permanence of this example of Mexico's cultural heritage for future generations.