Carrickfergus Castle is on the north shore of Belfast Lough not far from the city of Belfast. It was built in 1177 by John de Courcy and was in use as an armory, air-raid shelter and garrison until 1928 when it became a public attraction. We visited the castle twice on our recent trip to Northern Ireland, the first time with our daughter and the second with her and a visitor from Washington. The second time we toured the inside of the castle, something I had not done since the 1990's when we lived in Northern Ireland.