A small, very old and deeply fascinating island, once a bishopric, today it is an absolute must for anyone wishing to enjoy the beauty of the lagoon. Strolling along the canal-side you come to the centre of the island, a small square where important monuments bear witness to the historic importance of the site. The Cathedral of Santa Maria Assunta is the lagoon's oldest building: founded in 639, it's a splendid example of the Veneto-Byzantine style. The portico and the ornamental motifs on the facade are of particular interest, as is the marble cladding and the splendid mosaics in the interior. Opposite the Basilica are the remains of its ancient Baptistery (7thC) and, nearby, the 13th century Church of Santa Fosca. The Palaces of the Council and of the Archives that stand in the same square, today are the premises of the Estuary Museum: the former offers examples of Veneto-Byzantine art (paintings, codices and illuminated manuscripts) while the latter has sculptures, bas-reliefs and important archaeological finds. From the bell tower there is a splendid view of the lagoon and the Venetian hinterland.