Castle Hackett (Hackett's Castle), Galway - built 13th Century - Captain John Kirwan
Castle Martin, Galway - the Martin and Kirwan families intermarried
Shan Mukinish Castle, Clare - repaired by Major Kirwan in 1836
Other Castles said to be associated with the family are: Gardenfield, Glan and Woodfield - if you have photos of these places, please email me