The year in which the archaeological site of Teotihuacá*was added to the Unesco World Heritage list. The huge complex, an hour north of Mexico City by bus, is home to the Pyramid of the Sun, and is one of the most-visited attractions in Mexico. ticketbus.com.mx
The number of days that the forthcoming Moctezuma exhibition will be on at the British Museum. This exploration of the life and times of the last Aztec ruler opens 10am-5.30pm daily from 24 September until 24 January, with late opening Thursdays and Fridays until 8.30pm, admission £12. britishmuseum.org
The capacity of the Estadio Azteca, the official home stadium of the Mexican National football team, and the place where Maradona scored his infamous "Hand of God" goal against England in the 1986 World Cup quarter final. Stadium tours run from 9am-4pm from Monday to Friday, price 20 pesos (£1).
The approximate number of speakers of the Aztec's Nahuatl language, most of whom live in central Mexico. English words of Nahuatl origin include avocado, chilli and chocolate – a food thought to have been invented by the Aztecs. For good chocolate caliente (hot chocolate) in Mexico City, try El Cardenal at Palma 23. restauranteelcardenal.com
The number of months in the Aztec civil calendar. The beginning of the Aztec year is now assumed to be 2 February. BA flies from Heathrow to Mexico City in February from £570 return. ba.com
The year in which the Aztec empire fell to the Spanish. Mexico City now stands upon the Aztec capital of Tenochtitlan. The Museo del Templo Mayor marks the site of the Aztec's Great Temple. Open Tuesday to Sunday, from 9am-5pm, admission M$45 (£2), but free on Sundays. tiny.cc/ngHeA
The volume, in millions of cubic metres, of the Great Pyramid of Cholula, which, according to the Guinness Book of Records, makes it the largest monument in the world. It dates back to the pre-Aztec period but was still used as a ceremonial site in Aztec times. Stay at La Purificadora hotel in nearby Puebla, from £95 for a double. lapurificadora.com