Arcos de la Frontera is one of the most dramatic of the White Villages, a town balanced along a limestone ridge above the Guadalete River. It looks almost improbable from below: white houses climbing the cliff, church towers on the skyline, and the old town squeezed into a narrow spine of lanes.
The heart of Arcos is Plaza del Cabildo, where the basilica, castle, town hall, and cliff-edge viewpoint crowd into one compact square. The Basilica of Santa María gives the square its monumentality, while the Castle of Arcos reminds you that this was once a military prize.
Arcos is better treated as a place to climb and pause than as a checklist. The old streets narrow, bend, and rise hard; every few minutes a gap opens onto the plain far below. San Pedro and the smaller miradores reward anyone willing to keep walking beyond the busiest square.
Come by car if you are driving the white-village route, but do not try to conquer the old town with it. Park lower down, take your time, and save enough energy for the uphill return.