It's not just the country's main post office, or an eye-catching neoclassical building: the General Post Office is at the heart of Ireland's struggle for independence. The GPO served as command HQ for the rebels during the Easter Rising of 1916 and as a result has become the focal point for all kinds of protests, parades and remembrances and is home to an interactive visitor centre.
The building – a neoclassical masterpiece designed by Francis Johnston in 1818 – was burnt out in the siege that resulted from the rising, but that wasn't the end of it. There was bitter fighting in and around the GPO during the Civil War of 1922; you can still see the pockmarks of the struggle in the Doric columns. Since its reopening in 1929 it has lived through quieter times, although its role in Irish history is commemorated inside the Visitor Centre. For €10, you can take a self-guided tour of an exhibition that brings you through the causes, action and aftermath of the armed rebellion.