Hermitage of San Vicente Mártir Monument · Colmenar del Arroyo, Sierra Oeste, Madrid Of the hermitage built between the 12th and 13th centuries on the promontory of the Cerrillo de San Gregorio, only its bell gable is still standing, now built into the wall enclosing the municipal cemetery of Colmenar del Arroyo. Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid (CC BY 3.0 es) What to see and do in Colmenar del Arroyo