One of the Museum’s masterpieces, J.M.W. Turner’s Grenoble Bridge (1824), a watercolor that was purchased in 1968 and has rarely been shown due to its fragility. Click for detail. Joseph Mallord William Turner. Grenoble Bridge. (c. 1824).The Baltimore Museum of Art: Purchase with exchangefunds from Nelson and Juanita Greif Gutman Collection.BMA 1968.28