I walked quite a distance to find this as parking is not too easy with Phoenix Park, but I think it was well worth it. Not many megalithic kists remain and it is always good to find one, no matter what state it's in.
This is a beautiful little kist grave that has sadly been badly restored. The slab stone has been cracked many times and re-cemented back together and these seams are coming apart again. There is a small concrete pillar supporting the middle of the top slab.
The top slab itself is shaped like a kidney bean (probably caused by a missing piece), about 1.7m long and 60cm wide, with several (probably natural) cup marks in the top.
This is a very odd place. The house and the tall trees amke it really hard to get a feel for the spot. However, by standing in front of the house you can start to appreciate the place. Phoenix Park stands on Knockmary Hill, which is actually quite high. From here you can see right over the top of the city and you have an amazing view of the Dublin/Wicklow mountains. You can even make out the cairn on Seefingan and the two main monuments on Seahan Hill (County Dublin).
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This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.