Monasterio de Yuso

The 6th-century Monasterio de Yuso, sometimes called El Escorial de La Rioja, contains numerous treasures in its museum. You can only visit as part of a guided tour (in Spanish only; non-Spanish speakers will be given an information sheet in English and French). Tours last 50 minutes and run every half-hour or so. Maps detailing short walks in the region are available here.