The Patriarchal Cathedral Basilica of Saint Mark (Italian: Basilica Cattedrale Patriarcale di San Marco), commonly known as St Mark's Basilica. Detail of the facade. I have also painted the whole elevation.
 
The horses and Fourth Crusade: The four bronze horses on the loggia were taken from Constantinople in 1204 after the Fourth Crusade and became a visible statement of Venice’s triumphs; what you see outside are copies while the originals are preserved inside the basilica.
 
Interesting facts...
The clever Venetians hid or disguised treasures to prevent them being looted by Napoleon