On the upper floor of the basilica is St Mark’s Museum which is home to items from the history of the cathedral, including the original bronze horses which stood above the basilica’s door, fragments of mosaics, vestments, tapestries, and much more. The Treasury of St Mark’s contains 283 pieces made of gold, silver, and precious gems, including precious objects looted from Constantinople and liturgical objects from the cathedral’s own history. The last additional element inside the basilica is the Pala d’Oro, which is the high altar retable (or altarpiece) which was created in three stages between 1102 and 1345 and shows scenes from the lives of Jesus Christ and St Mark the Evangelist made out of enamel, gold, silver and 1,927 precious stones. The Pala d’Oro is only opened during liturgical celebrations, but you can see the stunning exterior on your visit. The basilica itself is free to enter but the museum, treasury, and Pala d’Oro all require separate tickets. Outside the basilica, you can also visit the Campanile di San Marco for an additional fee.