The mosaics represent the history of S.Mark.
One may walk or sit at will in S.Mark's as long as one wishes, free and unharassed; but a ticket is required for the galleries and a ticket for the choir and treasury; and the Baptistery and Zeno chapel can be entered only by grace of a loafer with a key who expects something in return for opening it.

The history of this loafer's privilege I have not obtained, and it would be interesting to learn by what authority he is there, for he has no uniform and he accepts any sum you give him.

If all the hangers-on of the Roman Catholic Church, in Italy alone, who perform these parasitical functions and stand between man and God, could be gathered together, what a huge and horrible army it would be!.