Palais Longchamp is a historical monument and park located in Marseille, France. It was built in the late 19th century to celebrate the construction of a water supply system that brought water from the Durance River to Marseille. The monument consists of two wings, one houses the Museum of Fine Arts and the other houses the Museum of Natural History. The two wings are connected by a triumphal arch, which is decorated with sculptures and reliefs.

The Museum of Fine Arts has a collection of works from the 16th to the 19th century, including paintings, sculptures, and decorative arts. The museum's collection includes works by artists such as Rubens, Van Gogh, and Cézanne.

The Museum of Natural History features exhibits on the natural history of the region, including geology, botany, and zoology. The museum also has a collection of fossils, minerals, and preserved animals.

The Palais Longchamp park is a popular spot for locals and tourists alike. The park features formal gardens, fountains, and a large pond with a waterfall. It's a great place for a picnic, a stroll, or simply to enjoy the views of the surrounding city.