Final answer:
The Inca civilization built the fifteenth-century site Machu Picchu in Peru, which functioned as an ancient observatory.
Step-by-step explanation:
Besides Stonehenge, one other ancient astronomy site is Machu Picchu, which was built by the Inca civilization. Located in Peru, Machu Picchu is a fifteenth-century site that, among its various functions, served as an ancient observatory. The Incas were highly skilled at measuring the positions of celestial objects, and they incorporated this knowledge into the construction of Machu Picchu, using it to track time and dates which was crucial to their agricultural practices and religious ceremonies.
Machu Picchu stands as a testament to the Inca civilization's profound understanding of astronomy, as evidenced by carefully aligned structures that captured celestial events. The site's dual role as both a strategic citadel and an astronomical observatory highlights the intricate connection between ancient cultures, celestial observations, and the practical applications of such knowledge in shaping their societies.