Answer:
1.Bridges were built everywhere in the empire. Their suspension bridges were built using natural fibers. Indigenous people still use the same technique in remote areas in the Andes.
2.Their buildings have proved earthquake resistant for 500 years and today they serve as foundations for many buildings.
3.The colorful clothing worn by traditional indigenous Peruvians is arguably the most immediately visible holdover from Incan times.
4. Between three and four million still people speak Quechua, the main language of the Inca.