St Mark's Basilica

The St Mark's Basilica (fully "Patriarchal Cathedral Basilica of Saint Mark") is one of the most important cathedral of Venice, Italy. It overlooks St. Mark's Square.
This cathedral is a rare example of Byzantine architecture in Western Europe. 
History.
Originally this cathedral was to be an extension of the Doge's Palace. It was begun in 829 and ended in 832 as building for the remains of St. Mark that had been brought from Alexandria.