St. Mark's Basilica is Venice's Byzantine cathedral, famous for over 8,000 square metres of golden mosaics covering its domes, vaults, and walls. Built in 1063 to house the relics of St. Mark the Evangelist (smuggled from Alexandria in 828), the basilica served as the Doge's private chapel and the ceremonial heart of the Venetian Republic for nearly a thousand years. Locals have called it the Chiesa d'Oro (Church of Gold) for centuries, and the name is earned the moment you step inside. The interior is staggering: gold-ground mosaics depict biblical narratives and the story of St. Mark himself across every curved surface. Behind the high altar, the Pala d'Oro is a jewel-encrusted golden altarpiece studded with nearly 2,000 precious stones, one of the finest surviving examples of Byzantine enamelwork. Upstairs, the museum level brings you face to face with the original bronze horses (the Cavalli di San Marco) that once adorned the facade, looted from Constantinople during the Fourth Crusade. The St. Mark's Basilica terrace also offers a rare elevated view over Piazza San Marco. St. Mark's Basilica tickets start at 10 EUR for general entry, with combination tickets available: basilica plus Pala d'Oro for 20 EUR, or a full ticket covering the basilica, Pala d'Oro, museum, and Loggia dei Cavalli for 30 EUR. Students under 26 and seniors over 65 receive a 50% discount. Children under 10 enter free. St. Mark's Basilica hours run Monday to Saturday from 9:30am (last entry 4:45pm), and Sundays from 2pm. On Sunday mornings, only the museum and Loggia are accessible to visitors.