Tour Scotland video of Floors Castle near Kelso on a visit to the Scottish Borders. This is the seat of the Duke of Roxburghe. It was built in the 1720s by the architect William Adam for the 1st Duke. In the 19th century it was embellished with turrets and battlements by William Playfair for the 6th Duke. Floors Castle lies on the River Tweed and overlooks the Cheviot Hills.