View larger size  Grand Ducal Palace / Academy of the Sciences A real eye-catcher on the southern end of Karl’s Square is a Baroque structure built by Louis Rémy de la Fosse in 1717-19. After 1805 it was used by the court of Baden as a Grand Ducal Palace. Its red-framed plaster facade was later remodeled along Classical lines, and now exhibits strict symmetrical patterns. Its grounds to the south hold a large courtyard and gardens. The Heidelberg Academy of the Sciences has been based here since the 1920s.