Mezquita of Córdoba

The great mosque of Córdoba, begun in 785, with a forest of more than 850 columns supporting red and white striped arches, and a dazzling mihrab of gold mosaics. After the Christian conquest, a Renaissance cathedral was built right in the middle of it.

Entry is free during an early-morning slot on most days (except Sundays), otherwise there's a fee. Climb the bell tower for views. Wander the narrow streets of the old Jewish quarter nearby, and in May see the flower-filled patios during the patio festival.