The Ancient Observatory, Beijing

This is a world-renowned astronomical building established 700 years ago. Constructed from gray stones, the building is sometimes mistaken as a section of the Great Wall in the urban center of Beijing. Several large, ancient, bronze astronomical devices on display were designed by early Jesuit astrologers and are well-worth looking at. They reflect a high level of complexity in terms of their construction, and they are also extraordinarily accurate for practical observation.