Mentioned by Guinness Storehouse
The Best Things to Do in Dublin
"There are few buildings that reflect the changing and often turbulent political history of Ireland better than Dublin Castle. A castle has stood here for nearly 900 years, with most of the current building dating from the 18th century, and until the Anglo-Irish treaty of 1921, it was the seat of the English and British governments in Ireland (the building itself witnessed several major events in the struggle for independence). Since then, it has hosted the inaugurations of Irish presidents, and also welcomed thousands of visitors as one of Ireland’s best tourist attractions."