St. Mark's Basilica is famous for its opulent Byzantine architecture, stunning golden mosaics, and historical significance as a symbol of Venice's power and wealth. It is a major pilgrimage site because it houses the relics of Saint Mark the Evangelist. The basilica's design, influenced by Byzantine churches, features a Greek cross floor plan, multiple domes, and a treasure trove of art, including the famous bronze horses of St. Mark taken from Constantinople. The basilica is a prime example of Byzantine architecture in the West, with influences also from Gothic and Islamic styles, reflecting Venice's history as a maritime republic that traded and fought in the East. The interior is covered in over 4,000 square meters of golden mosaics that depict biblical stories and the life of saints, creating a dazzling and otherworldly glow. Over centuries, Venice added elaborate features to the exterior, including marble columns, pinnacles, and the famous bronze horses, which were looted from Constantinople during the Fourth Crusade.