Kilkenny Castle, Ireland
Kilkenny Castle is one of the few buildings in Ireland with a long history of continuous occupation. The fortress was founded after the Norman conquest of Ireland, which resulted in a medieval ruling class in England, known as the Anglo-Normans, seizing land from the Irish.
Since then, the castle has been transformed but kept some features of the group that once conquered it, like the signature Anglo-Norman stone that covers the building entirely. The master-builder, William Marshal, 4th Earl of Pembroke, transformed this relic in the 14th century.