Monesterio de Yuso, San Millán de Cogolla. One of two monasteries in the town, this 16th century Augustinian monastery is the larger of the two. It houses a treasury of ivory carvings depicting scenes from the lives of San Millán and San Felices. This monastery is said to be the birthplace of the Castillian language?43 words scribbled into a Latin codex by a 10th century monk. La Rioja, Spain.