The San Marco Library is located in the Piazza San Marco in Venice, Italy. It is a 16th century building. It is a masterpiece left by the famous architect San Sovino in Venice. So San Sovino chose a narrow and long field to build it. It has a double-storey arcade structure like the general mansion, but slightly lower in height. This long arcade with classical pillars is simple and long, and is now a public place for shade and leisure.