Just 70 miles from Calais by motorway and famous for its two huge cobbled squares, laid out in the 13th century to house regional markets. The 155 gabled houses and stone arcades which lined the squares were completely destroyed during World War One and painstakingly rebuilt in the 1920s.

Take the lift up the belltower for a panoramic view of the city, then visit the 14th century underground passages beneath the squares which became British Army HQ during World War One. Watch the history film in the town hall, then follow the steel dots in the pavements for a walking tour.