The Chiesa di San Marco is a prominent church located in Venice, Italy. It is known for its stunning Byzantine architecture and rich history, dating back to the 9th century. The church serves as the cathedral of the Roman Catholic Archdiocese of Venice and is dedicated to Saint Mark, the patron saint of the city. Inside, visitors can admire beautiful mosaics and artworks, including the famous altarpiece that houses the relics of Saint Mark. The church is also adjacent to the Piazza San Marco, a bustling square that attracts tourists from around the world, making it a significant cultural landmark in Venice.