Killiney Hill is the southernmost of the two hills which form the southern boundary of Dublin Bay. Crowned by an obelisk, the hill is 153 metres high and has views over the surrounding areas: Dublin to the northwest; the Irish Sea and the mountains of Wales to the east and southeast; and Bray Head and the Wicklow Mountains to the south. The hill was higher in the past but material was removed from the summit for the construction of the pier at Dún Laoghaire.
The obelisk was completed in 1742 and commemorates the victims of the
Wikipedia https://en.wikipedia.org/wiki/Killiney_Hill
Address Ireland
Coordinates 53°15'55.78" N -6°6'41.197" E