The Norman fortress built by Giovanni Senza Terra was for a long time the symbol of English oppression. With its four corner towers, ramparts and moats, it has suffered numerous attacks, including that of Silken Thomas Fitzgerald, a rebel subject of the Crown. But don't think of the classic medieval castle: it was designed more as a residence than as a manor. The interior: about fifteen rooms and particularly pompous halls. Particularly noteworthy are rooms 3 and 5 for the delicately stuccoed ceilings, room 9 for its 18th century style and room 10 for its structure in the shape of a Greek temple. Finally, you will see the ancient ballroom, Saint Patrick's Hall, with its marvelous decorated ceiling. Today it is used as a place for ceremonies. Outside: you can admire the royal chapel, now returned to Catholic worship under the name of the Church of the Holy Trinity. It was built at the very beginning of the nineteenth century. The exterior is decorated with many heads representing illustrious Irish characters.