What did the Inca people build high up in the Andes mountains in Peru?

The Inca people built an extensive network of structures high in the Andes mountains, with the most famous being Machu Picchu. This ancient citadel served as a royal estate and religious site, showcasing advanced engineering and architectural techniques. The Incas constructed terraces for agriculture, temples, and a sophisticated water management system, all integrated into the rugged mountainous landscape. Their remarkable achievements reflect their ingenuity and adaptation to the challenging environment.