Córdoba was once (10th cent.) the biggest city in Western Europe, its glory faded over the centuries but such wonders of Islamic culture as the magnificent Mezquita (Mosque) still attracts the multitude of tourists. Mezquita with its terracotta-and-white-striped arches (image of the forest of date palms) is absolutely captivating, columns are many, to be exact 856 (used to be 1253).
Tip: admission is free every morning 8.30-10.00 (less crowded too).
Best time to visit Córdoba is from April to June as you can "participate" in Competition of Cordoban Patios. Look for "patio" signs, which means you can enter and enjoy its beauty for free (sometimes there is a container for donations).
Have a lunch like cordobeses do - tortilla de patata (potato omlette) and one (ice-cold of course) beer. Córdoba is famous for its bodegas, the biggest and probably busiest is Bodega Campos (Calle de Lineros, 32) - it's so big you can easily get lost in its labyrinths. Many rooms filled with oak barrels, signed by celebrities from all over the world, such as UK former prime minister Tony Blair.
The patio contest
Alcázar de los Reyes Christianos, 13th century
Alcázar's gardens (15th century)
Church ..."on surrender"
The mosque's greatest treasure - mihrab
The terracotta-and-white-striped horseshoe arch