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The Aztecs institutionalized sacrificial killing and turned killing on the battlefield into an art form.

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By 1449, the empire contained as many as 15 million people. But the Aztecs perfected a unique method, not only to provide a substantial food supply for its civilian populace, but to fuel the military expansion of its empire. This revolutionary engineering was called chinampas, a system that allowed them to literally create new land to farm and to live on. A chinampa is an artificial island built in the lake. A chinampa was built by weaving a web of sticks floating in the water and piling reeds on top of them. Mud was then scraped from the lake bottom and piled atop the reeds to form chinampas. It was this technology that transformed Tenochtitlan from just another tribal town in the 14th century to a dominant and thriving city-state.

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To bring clean water to their growing cities, the Aztecs would design and build something that only a few world empires would master, the aqueducts. One would be cleaned and maintained, while the other one was being used so the water flow was never interrupted.

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They revolutionised the architecture of the Americas : using a system of pilings made from wood. Because they needed strong foundations to built cities/buildings on. The pilings were often surrounded with volcanic stone to add strength. The Aztecs are the greatest engineers of the Americas.

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In order to transport riches to the heart of the empire, the Aztecs constructed a network of super highways, throughout central Mexico. Relay runners were stationed every few miles to create a sort of ancient federal express. Messages or goods could be sent 200 miles from the Gulf Coast to Tenochtitlan in just 24 hours. Faster than the postal service today.

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The Aztec nobility lived in grand palaces, which were decorated with intricate murals and housed multiple rooms for various functions.

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Aztecs played a ball game called "tlachtli," which had religious significance. The ball courts were often located near temples and were sometimes used for human sacrifice.

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The Aztecs built a system of canals and causeways to transport goods and people throughout the city. These waterways were used for transportation and trade.

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The Aztecs constructed impressive pyramids that served as religious temples, including the famous Templo Mayor in the heart of Tenochtitlan. Pyramids are the symbol of their absolute power. The base of the Great Temple was 240 feet deep by 300 feet wide and rose to a height of 15 storeys. The temple was rebuilt on the same location 7 times (beginning in 1325 with the city's founding).

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The Aztec society was organized into a strict social hierarchy, with the emperor at the top, followed by nobles, warriors, commoners and slaves. Social mobility was limited, and one's position was largely determined by birth.

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The Aztecs created a rich tradition of art and literature, including pictorial manuscripts and sculptures made from stone, wood, and other materials.

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The Aztecs had a complex polytheistic religion, which included many gods and goddesses. They believed in the cyclical nature of time and the importance of blood sacrifices to maintain the cosmic order. They used to be pulling out bleeding hearts from people for the Gods. Teotihuacan means city of the Gods. Gods are very significant to them.

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The Aztecs developed advanced agricultural techniques, including the use of chinampas, which were floating gardens built on rafts made of reeds.