San Marco is a historic district in Venice, Italy, known for its stunning architecture and rich cultural heritage. The area is home to the famous St. Mark's Basilica, a magnificent church adorned with intricate mosaics and a stunning façade. Piazza San Marco, the main square, is a popular gathering place for both locals and tourists, offering a vibrant atmosphere filled with cafes and shops. The district also features the Campanile di San Marco, a tall bell tower that provides panoramic views of the city. Visitors can explore the Doge's Palace, a former residence of the Venetian rulers, showcasing impressive Gothic architecture and historical artifacts.