Real Maestranza de Caballería de Ronda (bullring)
Ronda is where modern bullfighting was born and this was the first purpose built ring (before that fights were using conducted in the main plazas. Even if you are morally opposed to the "sport" its part of Spain and the sight here is fascinating. There is an interesting museum and then you can wander out into he ring and salute your 5,000 fans.