The Inca tribe is known as the most advanced civilization in South America in the past.
They build a large highway and a suspension bridge made of rattan rope.
Experts believe that Incas practice skull surgery to treat several diseases.
Inca, Quechua language, is still used by people in Peru, Bolivia, Ecuador, and Chile.
The Inca tribe uses a very advanced and sophisticated accounting system.
They build cities and villages in the steep and difficult mountains of Andes.
Incas are famous for beautiful textile crafts, including clothing, woven fabrics, and mats.
The Inca tribe believes that the wealth of the earth and nature belongs to everyone, and they live in a very egalitarian society.
They have a very advanced irrigation system to irrigate their fields in dry and rocky mountainous areas.
The Inca tribe has a very accurate and complicated astronomy calendar, and they hold religious ceremonies to commemorate important astronomy events such as solstis and equinox.
