O'Connell Bridge

he original bridge (named Carlisle Bridge for the then Lord Lieutenant of Ireland - Frederick Howard, 5th Earl of Carlisle) was designed by James Gandon, and built between 1791 and 1794.
Originally humped,^[1] and narrower, Carlisle bridge was a symmetrical, three semicircular arch structure constructed in granite with a Portland stone balustrade and obelisks on each of the four corners.^[2] A keystone head at the apex of the central span symbolises the River Liffey, corresponding to the heads on the Custom House (also designed by James Gandon) which personify the other great rivers of Ireland.