The Orangery Palace was built during the reign of Landgrave Charles between 1703 and 1711 AD, and since then, it forms the northern corner of Karlsu Park, and today it is used as a museum and storehouse for astronomy and energy. This Baroque palace was built in the French architectural styles. The main building is 139.40 meters long and is designed as a low structure with a higher middle section of two floors and two high wings of three floors. The architecture of the building continued in the axes of the Baroque garden, and the long galleries served as dance halls and at the same time as a winter home for preserved plants. This palace is still an important landmark from which architects inspire their work to this day.