You may spot Glendalough Cathedral from a distance before you actually find this incredible building. Step inside if the doors are open or just appreciate the facade from the street.
When it comes to things to do in Glendalough, Glendalough Cathedral is rated by fellow travelers. And in great news for your budget, it's free. Wicklow Mountains National Park, Clara Lara Funpark and The Wicklow Way are also worth seeing and are within easy reach of the principal church.