Tourism in the Republic of Ireland on were built by them. As Dublin Airport is located just outside the city, most international visitors to Ireland begin their stay here. Among the main attractions in Dublin are Dublin Castle, the seat of British rule in Ireland until 1922, Phoenix Park, one of the largest inner city parks in the world, The General Post Office, one of Ireland's most famous buildings due to the 1916 Easter rising, Kilmainham Gaol, a former prison turned museum that held and executed the rebels of the 1916 Rising and Trinity College, where the Book of Kells and the Book of Durrow are
Michael Collins (Irish leader) to his appointment as financial advisor to Count Plunkett, father of one of the Easter Rising's organisers, Joseph Plunkett. Collins took part in preparing arms and drilling troops for the insurrection. The Rising was Collins' first appearance in national events. When it commenced on Easter Monday 1916, Collins served as Joseph Plunkett's aide-de-camp at the rebellion's headquarters in the General Post Office (GPO) in Dublin. There he fought alongside Patrick Pearse, James Connolly, and other members of the Rising leadership. The Rising was put down after six days, but the insurgents achieved their goal of holding their positions for the