It sits high on a crag on the Isle of Mull, Scotland, overlooking the Sound of Mull at its intersection with the Loch Linne and the Firth of Lorne.

In the 13th century there was a curtain wall enclosing a courtyard built there, and then in 1350 AD Lachlan Lubanach married Mary Macdonald, the daughter of the Lord of the Isles, and she was given the castle as her dowery. This is when the Keep (the Tower House) was built. The family left in 1691 when they retreated to the Treshnish Isles, surrendering Duart to to the Duke of Argyll. At this time the government troops took it over, using it as a garrison. It then was abandoned after the Jacobite Rising of 1745.

It laid in ruins until 1910 when it was purchased by Sir Fitzroy Maclean who restored the building.