SightSee the Halle CirculaireThe circular market hall in the centre of the main square is unique in southwest France. The round stone and timber structure, with its conical roof supported by Tuscan columns, sits within a triangular plaza of arcaded medieval buildings. The proportions, the materials, and the simple elegance of the ensemble are striking. Sit under the hall's roof on a hot afternoon and look out through the columns to the square. This is one of the most distinctive architectural landmarks…