Drive further northwards through an untamed landscape to Caithness on the far northern tip of Scotland. While en route, try to find time for a visit to Helmsdale, Lybster, Keiss and Wick, all places with Sinclair associations.
At the northern end of Sinclair's Bay, near the area's principal town of Wick, lies the dramatic clifftop ruins of Keiss Castle. In Wick itself, you'll find an excellent museum and archive run by the Wick Society.
The ruins of Castle Sinclair at Girnigoe, about a mile from Wick, is another must-see destination and arrangements for access can be made through the Sinclair Study Centre based at Noss Head Lighthouse.
Follow the coastline west until you reach the Castle of Mey, overlooking the Pentland Firth. This was the much-loved retreat of HM Queen Elizabeth, the Queen Mother and was built between 1566 and 1572 by George, 4th Earl of Caithness, who passed it to his second son, William Sinclair. On his death a short time later, it went to the third son, George Sinclair, who founded the family of the Sinclairs of Mey. The castle and its grounds are open to the public.