Musée Cognacq-Jay is a museum packed with 18th-century art and wonders in a classic French Renaissance mansion, located in the Marais District in Paris. The museum's collection was brought together by Ernest Cognacq and his wife Marie-Louise Jay between 1900 and 1925. This VIP couple had quite an influence on Paris, as they also founded the department store La Samaritaine, though they invested the majority of their fortune in French 18th-century works of art.