The ancient site known for its remarkable architectural achievements in the Andes is Machu Picchu. This iconic Incan city, built in the 15th century, is located high in the Peruvian Andes and showcases the ingenuity of Incan engineering and architecture. Machu Picchu features intricate dry-stone construction, terraced agriculture, and sophisticated water management systems. It served as a royal estate and a religious site and was largely forgotten until its rediscovery by Hiram Bingham in 1911. Today, it is recognized as a UNESCO World Heritage site and remains one of the most popular tourist attractions in the world, symbolizing the richness of Incan culture and history.