There are loads of castles from the well-restored and occupied like Castle Duart, to the crumbling and very ruined Ardtornish Castle. Eighty of them are in Argyll alone, I understand out of about 2000 in Scotland. For maximum castle density head for the Sound of Mull. Or take your pick from, in alphabetical order of anchorage:

 

Achadun Castle, Lismore: very ruined

Ardencaple Bay, Firth of Lorne: Ardfad Castle, hardly anything left

Ardtornish Bay, Sound of Mull: Ardtornish Castle, ruined, great viewpoint

Aros Castle, Sound of Mull: ruined

Canna: Coroghan Castle, very ruined but lovely beach

Castle Sween, Kintyre: massive ruin plus caravan site

Dallens Bay, Lower Loch Linnhe: Castle Stalker, picture-postcard, restored, privately owned but does tours

Duart Castle, Sound of Mull: the epicentre of Clan Maclean, well worth a visit

Dunstaffnage Castle: Lower Loch Linnhe, good example of medieval castle, quite a lot left

Gallanach Bay, Firth of Lorne: Duntrune Castle, privately owned, restored

Garvellachs, Firth of Lorne: Dun Chonnuill castle; hardly anything left, hard of access

Gylen Castle, Firth of Lorne, Kerrera: great position, a lot of ruin to inspect

Kinlochaline Castle, Loch Aline, Sound of Mull: privately owned, hidden away.

Lagavulin, Islay: Dunyvaig castle, very ruined

Loch Breachacha, Coll: the old castle, restored, privately owned

Loch Buie, South Mull: Castle Moy, ruined, being stabilised, maybe has been by now

Loch Moidart: Tioram Castle, disintegrating

Mingary Bay, Loch Sunart: Mingary Castle, privately owned, being restored, now an up-market hotel

Oban, Firth of Lorne: Dunollie Castle, creepy ivy covered ruin, being stabilised

Port na Moralachd, Lismore: Castle Coeffin, ruined

Rum, Kinloch castle: amazing Edwardian pile, a must see (before it is too late)

Shuna Castle, Lower Loch Linnhe: ruined

South Shian, Loch Creran: Barcaldine Castle; wonderfully restored L plan house, up market B&B

Tarbert Castle, Kintyre; better view from than of

Torosay Castle, Sound of Mull: Victorian gothic, now closed to the public, wonderful gardens but also closed

 

 

 

 

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Duntrune Castle, Gallanach Bay