Over the chief portal are four bronze horses, brought here in 1204 from Byzantium. The steeds are beautifully modelled, and the work is ascribed to Lysippos, a sculptor of Corinth. Napoleon took the horses to Paris, but they were restored to Venice in 1815.
The mosaic designs of the façade represent "The Last Judgment," among other Scriptural subjects, while one of the mosaics depicts San Marco as it was in the early days. A number of reliefs and images adorn the arches of each of the five doorways of the main entrance.
Within the decorations are exquisite. Ruskin writes: "The church is lost in a deep twilight, to which the eye must be accustomed for some moments before the form of the building can be traced; and then there opens before us a vast cave, hewn out into the form of a cross, and divided into shadowy aisles by many pillars. Round the domes of its roof the light enters only through narrow apertures like large stars; and here and there a ray or two from some far-away casement wanders into the darkness, and casts a narrow phosphoric stream upon the waves of marble that heave and fall in a thousand colours along the floor. What else there is of light is from torches or silver lamps, burning ceaselessly in the recesses of the chapels; the roof sheeted with gold, and the polished walls covered with alabaster, give back at every curve and angle some feeble gleaming to the flames, and the glories round the heads of the sculptured saints flash out upon us as we pass them, and sink again into the gloom."
In the vestibule of the cathedral, the mosaic decoration depicts Old Testament scenes. In the apse are represented a figure of the Lord, with St Mark, and the acts of St Peter and St Mark. The mosaics of the east dome represent Jesus and the prophets. Tintoretto's design is in an adjoining archway, and in the centre dome is "The Ascension." The western dome has "The Descent of the Holy Ghost," and an arch here is decorated with "The Last Judgment." There are more mosaics in the aisles, illustrating "The Acts of the Apostles."
The high altar is a superb example of sculpture. The roof is supported by marble columns, carved with scenes from the lives of Christ and the Virgin Mary. The figures date from the eleventh century. A magnificent altarpiece of gold-workers' design is shown for a fee. The upper part is the older, and it was executed in Constantinople. The lower portion is the work of Venetian artists of the twelfth century.