St Mark's Basilica After-Hours Tour with Optional Doge's Palace Visit. See the wonders of Venice's St. Mark's Basilica without the crowds during this after-hours small-group tour. Learn from a knowledgeable guide about the basilica's famed mosaics. Explore the crypt below the church to see where St Mark's remains are said to lie. Choose an optional upgrade to see the Doge's Palace after the basilica to see the former home of the Venetian Republic's government. Book and Save 37%: St Mark's Basilica After-Hours Tour with Optional Doge's Palace Visit.