The Church of St. Mark is a historic church located in Venice, Italy. It is known for its stunning Byzantine architecture and intricate mosaics that adorn its interior. The church serves as a significant religious site and is dedicated to St. Mark the Evangelist, the patron saint of Venice. Constructed in the 9th century, the church has undergone several renovations and expansions over the years. It is part of the Piazza San Marco and attracts millions of visitors annually. The church also houses the remains of St. Mark, which were brought to Venice in the 9th century, making it a vital pilgrimage site.