Dominating the city’s skyline, the Cathedral is a breathtaking triumph of Romanesque-Gothic architecture. Its famous façade, glittering with golden mosaics and intricate bas-reliefs, is often called the "Golden Lily of Cathedrals." Inside, the atmosphere shifts from the elegant simplicity of the striped marble nave to the dramatic power of Luca Signorelli’s frescoes in the San Brizio Chapel—a masterpiece that inspired Michelangelo’s Sistine Chapel.