What are some notable locations and attractions near Lille in the Hauts-de-France region?

Many of the highlights of the Hauts-de-France region lie within the Pas-de-Calais department, which stretches south and west of Lille. Swing by Arras to admire UNESCO-listed architecture and visit WWI battlefields and war tunnels, then continue to nearby Lens, home to the Louvre-Lens Museum.