Cordoba is a city where three cultures converge, a UNESCO World Heritage site. The red-and-white arches of the Mosque-Cathedral are breathtaking; the Roman Bridge spans the Guadalquivir River; Calleja de las Flores is the most beautiful alley, where white walls are adorned with vibrant flowers; the courtyards of Palacio de Viana are exquisite. During the Patio Festival in May, the city's courtyards compete in splendour. The local cuisine is famous for salmorejo, flamenquín, oxtail stew, pastel cordobés, and Montilla-Moriles wine.