 Today , a few buildings remain of the original monastery in Spain . These include the winery or bodega , now the oldest surviving building on the site . This was built in the 13th century during the reign of Henry I of Castile , with the upper floor built as a dormitory 27 by 90 feet ( 8 @.@ 2 by 27 @.@ 4 m ) with a long barrel @-@ vaulted ceiling . Outside of the bodega , crumbling walls , open yards and part of the Gothic roof of the church are visible . The double arches in the walls of the Renaissance @-@ era cloister are still standing , but the arched roof is lost . The foundation of the church can be seen . 
