Mountjoy Square is the one the north side got exactly right — the only truly square Georgian square in Dublin, each of its four sides a measured 140 metres, laid out in the 1790s for the cream of the city before the Act of Union pulled the money south.
Climb up Gardiner Street from Connolly, past terraces that have seen better centuries, and the square opens at the top. Stand at a corner for the symmetry, then walk the east side, where Seán O'Casey lived and set Shadow of a Gunman in the tenement rooms hidden behind the grand fronts. The central garden, locked for years and open again, is the place to sit; from the middle the four ranges close in and the city goes quiet.
Off the south-west corner is Belvedere College, the Jesuit school where Joyce was a boy and which he made the Belvedere of A Portrait of the Artist. Then walk north-east and Croke Park rises over the rooftops — the cathedral of Gaelic games, and the ground of the first Bloody Sunday. Buses home run from Gardiner Street.