St. Mark's Cathedral is a landmark building in Venice, located in St. Mark's Square, built by Venetian merchants in 829 AD to transport St. Mark (the author of the Gospel of Mark) back to Venice. The entire church adopts Byzantine architectural style, combining the essence of East and West architecture. The interior is decorated with many Byzantine-style mosaic decoration paintings, and below the altar of the church is the tomb of St. Mark. Visiting the church is free, and you have to pay to visit the museum, corridor and gold altar. This building is a Byzantine-style masterpiece. It is characterized by the structure of the Greek cross and the five large mosaic domes on the outside. On its front there is a replica of one of the four horses of St. Mark (the authentic is a gold-plated bronze statue, displayed in the St. Mark's Museum). At the top of the bell tower you can enjoy stunning views of the entire city and lagoon.