How advanced were the incans?

The Incas were highly advanced in various aspects, including agriculture, architecture, and engineering. They developed an extensive road system that spanned over 25,000 miles, facilitating communication and trade across their vast empire. Their agricultural techniques, such as terrace farming and irrigation, allowed them to thrive in the challenging Andean environment. Additionally, they constructed impressive stone structures, like Machu Picchu, showcasing their sophisticated understanding of materials and design.