Today, 64 years ago, on December 2, 1961 (Calendar, October 25, 1961), Mexican archaeologists completed the excavation of the Aztec pyramid. On December 2, 1961, Mexican archaeologists completed the excavation of the Aztec pyramid in Tenochtitlan. This pyramid, built more than 800 years ago, is well preserved and the size is equivalent to one-tenth of the famous solar pyramid located in the ancient city of Dartmouth.