The Inca Empire is renowned for its extensive road systems and remarkable architectural feats. Flourishing in the Andean region of South America during the 15th and 16th centuries, the Inca developed an extensive network of roads that spanned over 25,000 miles, facilitating trade and communication across diverse terrains. They are also famous for their architectural achievements, such as Machu Picchu and the Sacsayhuamán fortress, which showcased advanced engineering techniques and integration with the surrounding landscape. The Inca's ability to adapt to their environment and create sustainable infrastructure is a hallmark of their civilization.