The Inca Empire was called "Tahuantinsuyu" by the Inca, meaning "Land of the Four Quarters," and was one of the greatest ancient civilizations. The Inca Empire had approximately 10 million people under its control as well as more than 100 different languages and was the largest empire of its kind when it existed.
The Inca civilization is credited with many novel inventions including master building. The Inca people constructed huge buildings and monuments out of stone and developed a complex highway network that made it possible for people to move across different kinds of dangerous terrain from mountains to ravines. They also had stations approximately every one to two miles for traveling messengers to be able to rest. The Inca Empire, however, fell apart quickly when the final emperor was executed.