George Bauer takes a trip back in time, beginning his castle trek on the River Tweed, at Traquair, the oldest continuously-inhabited house in Scotland. In central Scotland, he visits Stirling Castle-the must-see abode of Renaissance royalty including Mary, Queen of Scots-and Doune Castle, highlighted in the 1974 movie Monty Python and the Holy Grail. In western Scotland, George stops at Culzean Castle, a cliff-top edifice with a commanding view of the sea.