1. In 1911, an American explorer, Hiram Bingham **discovered** the lost city of Machu Picchu in Peru with the help of local farmers.
2. The city **dated back** to 1450.
3. The emperor **ruled** the Inca Empire with his army.
4. The Incas **lived** in stone houses.
5. They **worked** as farmers and craftsmen. They grew corn, potatoes, tomatoes, beans and peppers.
6. They **were** also great engineers and architects.
7. They **had** beautiful temples.
8. The Incas **had** food with the use of animals.
9. Only boys from the upper classes **attended** school.
10. The Incas **invented** many wind instruments, like the panpipe flute.
11. They **were** an Andean population of around 12,000,000 people within a period of 100 years.
12. In 1572 the Incan Empire **ended** after the Spanish killed the last Incan ruler, Túpac Amaru.