the valley of glendalough in wicklow mountains, ireland

mountain hill reservoir ridge terrain lake fell plateau wilderness landscape highland cliff valley geology walking hiking trail glendalough wicklow mountains ireland popular beautiful strenous hike inclines rewards panoramas unique vistas nice day sunshine national park south dublin largest parks scenic irish europe european outdoor outdoors outside activities activity blue hectares old churcit ruins church cemetery nearby cathedral ancient beautiful cemetery monastic city important sites ireland early christian settlement 6th century number remains impressive round tower high lake sunshine parks monastic archaeology city stream sunny ruins