Andalucia's interior crowns Seville's Cathedral and Giralda, Córdoba's Mezquita with its forest of pillars, and Granada's Alhambra fortress carved with Arabic poetry above the Sierra Nevada.
Seville Holy Week processions through April, Feria de Abril two weeks after Easter with flamenco-dressed Sevillanas, and pleasant temperatures across all three cities.
Hits 42°C in Seville and Córdoba, walking the open patios punishing by 11am, but the Sierra Nevada (3,479m) above Granada stays 15°C cooler.
Olive harvest in Jaén, vineyards around Montilla-Moriles in fortifying, and the Cordoba Patio Festival in May aside, autumn brings the cities back to walking comfort.
Mild winter around 14°C the best window for Andalucia walking, Seville and Córdoba's tapas culture indoors, and Sierra Nevada ski runs above Granada December-April.