The Ca' da Mosto is a thirteenth-century palace in Venice, northern Italy, the oldest building on the Grand Canal. It is in the Veneto-Byzantine style, with high narrow arches and distinctive capitals. The features of the palace show its beginnings as a casa-fondaco, the home and workplace of its original merchant owner. A second floor was added at the beginning of the sixteenth century, and a third in the nineteenth. The palace takes its name from the Venetian explorer Alvise da Ca' da Mosto, who was born in the palace in 1432.