St. Mark's Square, known as Piazza San Marco, is the main public square in Venice, Italy. It is famous for its stunning architecture, including the Basilica di San Marco and the Campanile di San Marco. The square serves as a gathering place for both locals and tourists, often filled with cafes and shops. The square is also home to historical landmarks like the Doge's Palace and the Clock Tower. Visitors can enjoy the vibrant atmosphere, especially during events and festivals. St. Mark's Square is often considered the heart of Venice, showcasing the city's rich cultural heritage.