Arcaded Plaza Mayor of Aguilar Monument · Aguilar de Campoo, Montaña Palentina, Palencia Image of Aguilar de Campoo, not of the place itself. Presided over by the collegiate church of San Miguel, it is closed by arcades and glazed galleries over stone pillars; it is considered one of the most notable arcaded squares in Castile and it structures the medieval quarter of the town. Photo: Igor González Martín from Madrid, Spain (CC BY-SA 2.0) What to see and do in Aguilar de Campoo