Question: At the center of Rothesay, Bute, is what ruined castle that is described as one of the most remarkable in Scotland, and dates back to the beginning of the 13th century?
Sentence (from "Rothesay, Bute"): At the centre of the town is Rothesay Castle, a ruined castle which dates back to the 13th century, and which is unique in Scotland for its circular plan.
Relevant evidence: Yes