While the basic structure of the building has been much altered, its decoration changed greatly over time. The succeeding centuries, especially the fourteenth, all contributed to its adornment, and seldom did a Venetian vessel return from the Orient without bringing a column, capitals, or friezes, taken from some ancient building, to add to the fabric of the basilica. Gradually, the exterior brickwork became covered with various marbles and carvings, some much older than the building itself. The last interventions concerned Baptistery and St Isidor’s Chapel (1300s), the carvings on the upper profile of the facade and the Sacristy (1400s), the Zen Chapel (1500s). This cathedral is a prime example of Gothic architecture due to the fact of its appearance from a distance.