monastic site in clonmacnoise

celtic ancient clonmacnoise ireland culture history heritage irish religion cross monastery cathedral church monastic medieval tourism stone travel architecture europe ruins landmark cemetery monument historic historical religious celt abbey building county shannon grave graveyard temple gaelic ruin old tomb destination summer ciaran grass pilgrimage christianity catholic site include two round towers three high crosses nine churches 700 early christian graveslabs ciarã¡n founded banks river 6th century flourished great seat learning university time students