1742. Famine relief. Still there.
The obelisk and the famine
The 1742 obelisk on the summit of Killiney Hill was not built for decoration. John Mapas, a wealthy local landowner, commissioned it during the Irish famine of 1740-41 as a public works project - paid labour to keep local families from starving. The inscription carved into its base is matter-of-fact about it: 'Last year being hard with the poor, walks about these hills and this were erected by John Mapas, June 1742.' You can climb inside the base via a doorway on the east side to reach a small viewing chamber and a platform at the top. The stairs are narrow. The view is worth it.
The expensive road above the sea
The Vico Road
The Vico Road runs between Killiney and Dalkey along the top of the cliff, with the sea below and the houses above. It is named after Vico Equense, the Italian village on the Bay of Naples that the views supposedly resemble. Killiney Bay has been compared to the Bay of Naples often enough that the comparison has become a cliché - but the road itself, on a clear morning, does not disappoint. Bono's house is here. So are those of several other musicians and writers who chose the south Dublin clifftop over anywhere else. You will not see the houses; you will see the sea, which is better.
Open sea swimming. All year.
The Forty Foot
The Forty Foot at Sandycove - one kilometre north, technically in the Dalkey/Sandycove area - is an open-sea swimming spot that has been in continuous use since the 18th century. It appears in Ulysses. It is used year-round by people with no apparent threshold for cold water. From Killiney beach you can walk north along the shoreline and arrive at it. The temperature in January is not a topic of discussion. You either get in or you don't.