The ancient little town of Aguilar de Campóo, on the Río Pisuerga, is believed to have been the Roman settlement of Vellica. It flourished particularly between the 13th and 15th centuries, when the town and surrounding area formed a marquisate.
The Early Gothic church of San Miguel, in the Plaza de España, contains many tombs of the 12th-16th centuries. Particularly fine are the tombs of the Conde de Aguilar and his wife and Archpriest García González. Other churches worth seeing are Santa Cecia (Romanesque) and Santa Clara (Gothic).
Address: San Miguel, E-34800 Aguilar de Campóo, Spain
Aguilar de Campóo has preserved six gates in the old town walls, including the 14th century Puerta de Reinosa, with a Hebrew inscription which is all that remains of the old Jewish quarter. The 12th century castle which looms over the town is now in ruins.