Explore one of the worlds most beautiful cathedrals on this 1 hour guided tour of st marks basilica skip the long lines and head inside thebyzantine landmark located in the heart of venice with your experienced guide and group hear the fascinating story of its history discover the tale of how st marks ruins came to rest here and wander among stunning golden mosaics and priceless treasure including the breathtakingpala doro altar which glimmers with emeralds sapphires and rubie