Cuauhtinchan Archeological Zone or Malinalco Archeological Zone, located just west of the town center on a hill called Cerro de los Idolos, which rises 215 meters above the town. On its sides are a number of pre-Hispanic structures built on terraces built into the hill. The main structures are at the top. This is one of the most important Aztec sites and was discovered in 1933, and explored by José Garía Payón in 1935.