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
Easter Rising of the "Aud" and the arrest of Casement, Nathan conferred with the Lord Lieutenant, Lord Wimborne. Nathan proposed to raid Liberty Hall, headquarters of the Citizen Army, and Volunteer properties at Father Matthew Park and at Kimmage, but Wimborne insisted on wholesale arrests of the leaders. It was decided to postpone action until after Easter Monday, and in the meantime Nathan telegraphed the Chief Secretary, Augustine Birrell, in London seeking his approval. By the time Birrell cabled his reply authorising the action, at noon on Monday 24 April 1916, the Rising had already begun. On the morning of Easter Sunday,