The Château de l'Observatoire is a historic building located in the city of Nice, France. Originally constructed in the 19th century, it served as an astronomical observatory. The château is known for its stunning architecture and beautiful views of the surrounding landscape, making it a notable landmark in the region. Today, the château is part of the Observatoire de la Côte d'Azur, which conducts research in astronomy and astrophysics. The site is also a popular destination for visitors interested in science and history, offering insights into the advancements in astronomy that have taken place over the years.