Thanks James.
Since moving to Ireland, I have been itching to go see his Grave... what I didn't know is that he only spent a little amount of his life in Sligo. He was born in Dublin, lived in both France and England. He did however spend a fundamental part of his childhood and adult holidays there.
I think you might be referring to the rock formation called "Ben Bulben" it is indeed a strange and unexpected site, of which my child compared to looking like an upside down boat!
Here are my attempts to capture it- this did prove rather difficult due to the low veil of mist/cloud that sort of ate away the top part of the rock.

Here Is the Thread Where We Post Pictures We Took and Stuff

Here Is the Thread Where We Post Pictures We Took and Stuff
This is a Google Image version..... gives a better view, but in my opnion, less atmospheric!
http://www.strandhillscenes.com/sitebuildercontent/sitebuilderpictures/Benbulben-webby.jpgI did want to visit his holiday home which is situated close to his resting place, however it was shut, so a good reason to go back.
Interestingly the place where is is buried, is actually in the grounds of a church his Great Grandfather was rector of.

Here Is the Thread Where We Post Pictures We Took and Stuff

Here Is the Thread Where We Post Pictures We Took and Stuff

Here Is the Thread Where We Post Pictures We Took and Stuff