With its spires, pinnacles, gables and countless statues, this cathedral (begun in 1386 and not completed until 1809) is an unforgettable sight, especially when the afternoon sun shines on the white stone. Admire its apse, and head up to the rooftop terrace or the seventh floor of the department store La Rinascente for remarkable views. The interior is sober bordering on the austere and is striking for its very vastness.