2. From 1438 to 1533, the Incas used a variety of methods, from conquest to peaceful assimilation, to incorporate a large portion of western South America, centered on the Andean mountain ranges, including, besides Peru, large parts of modern Ecuador, western and south central Bolivia, northwest Argentina, north and central Chile, and southern Colombia into a state comparable to the historical empires of Eurasia.

3. Architecture was by far the most important of the Inca arts, with textiles reflecting motifs that were at their height in architecture. The main example is the capital city of Cusco. The site of Machu Picchu was constructed by Inca engineers. The stone temples constructed by the Inca used a mortarless construction that fit together so well that a knife could not be fitted through the stonework.

4. Incan architecture is the most significant pre-Columbian architecture in South America. The Incas inherited an architectural legacy from Tiwanaku, founded in the 2nd century BCE in present day Bolivia. The capital of the Inca empire, Cuzco, still contains many fine examples of Inca architecture, although many walls of Inca masonry have been incorporated into Spanish Colonial structures. The famous royal estate of Machu Picchu is a surviving example of Inca architectureIncas Tiwanaku BoliviaCuzcoMachu Picchu