Visiting Venice without visiting the Doge's Palace would be unthinkable. The line at the ticket office was very long. The way to circumvent that is to use a combined ticket with the Correr Museum - the museum at the other corner of the Piazza San Marco. The line at the Correr Museum was much shorter.
The Palace was opulence itself. The walls and ceilings were painted by the most prominent Venetian painters, such as Tintoretto, Titian, and Veronese.
It was interesting to walk through the Bridge of Sighs to get to the dungeon and prison cells.