Location: Cardross, Argyll and Bute, Scotland.
Built: 16th century.
Ownership / Access: Roman Catholic Church.
Opening Times: Check their website for more info.
Price of Admission: Check their website for more info.
Notes: Kilmahew Castle is a ruined castle located just north of Cardross, in the council area of Argyll and Bute. Kilmahew is named for its patron saint, Mochta (Mahew).The castle was originally a four-storey 16th century tower house. Modifications made in 1744 are attributed to the architect John Douglas. Some obvious gothic modifications were done during the 19th century by Alexander Sharp, who owned the castle at the time.
Kilmahew Castle Links:Kilmahew Castle On Wikipedia
a site with some pictures of the ruin
Annals of Garelochside, which contains some descriptions of the ruin
Kilmahew Castle (RCAHMS)