Want to breathe fresh air? We’ll take you on a tour of the Evoissons valley. The walk starts at Poix-de-Picardie. This is a village nestled in green landscape. The beautiful 16th-century, flamboyant style Saint-Denis church features sculpted keystones. Another curious feature of the landscape is the Poix viaduct (1866), which measures 246 m long. It is entirely made of bricks. It crosses the Fay valley, which is 33 m deep.