St Mark’s Basilica (Basilica di San Marco) is one of the most stunning churches in Italy, built in the relatively rare Italo-Byzantine style. Decorated in over 86,000 square feet (8000m²) of ground gold mosaics, visitors will be in awe at the sight of the majestic interior. You can also visit the basilica’s treasury, it’s elaborate altarpiece, the Pala d’Oro, a museum on the upper floors, or even climb the Campanile for an excellent view of Venice.