Castle Hackett (Hackett's Castle), Galway - built 13th Century - Captain John Kirwan
Castlehacket House built in 1703. The castle (above this picture) is a ruin close by. For a full history read “The Kirwan’s of Castlehacket” By Ronan Lynch. Publisher: Four Courts Press
Gardenfield, about 3 miles north of Tuam. This house was replaced by another Gardenfield House which is still inhabited.
Castle Martin, County Kildare - the Martin and Kirwan families intermarried
Shan Mukinish Castle, Clare - repaired by Major Kirwan in 1836
Other buildings said to be associated with the family are: Glan and Woodfield - if you have photos of these places, please email me