Construction began in 1063 atop the ruins of two earlier churches, both destroyed by fire. The Doge commissioned Domenico Contarini to design a cathedral that would house the relics of St. Mark the Evangelist, stolen from Alexandria in 828 by Venetian merchants. Over three centuries, successive doges added layers of marble, gold leaf, and plundered Byzantine treasure. The result is 8,000 square metres of gilded mosaic — more than any other church in Christendom — depicting scenes from the Old and New Testaments across five domes and every wall surface. The Pala d'Oro, a jewel-encrusted altarpiece completed in 1345, contains 1,300 pearls, 300 emeralds, 300 sapphires, 400 garnets, 100 amethysts, and enamels looted from Constantinople during the Fourth Crusade. Four bronze horses above the main portal once crowned the Hippodrome of Constantinople before Doge Enrico Dandolo seized them in 1204. The originals now rest inside the basilica museum; the exterior quartet are 1980s replicas installed to halt acid-rain corrosion. Basilica san marco tickets skip the line grant access to the main nave, chapels, and upper galleries. The treasury holds reliquaries and liturgical objects spanning ten centuries, while the museum level offers eye-level views of the mosaics' gold tesserae. Sunday morning Mass restricts tourist entry until 14:00, and the dress code bars bare shoulders and knees year-round. The Pala d'Oro and treasury each require separate tickets beyond the 10 EUR conservation fee introduced in 2018. Light enters through alabaster windows, casting amber hues across the Pentecost Dome and the central Ascension Dome, where Christ rises within a star-studded firmament. The marble floor undulates from centuries of settling wooden pilings driven into lagoon silt. Securing basilica san marco tickets skip the line tours ensures you bypass the Piazza San Marco queues that stretch 90 minutes during peak summer and cruise-ship mornings, entering through the north transept reserved for pre-booked visitors.