A merchant city since its origins and a manufacturing city since the 16th century, the Industrial Revolution made it a great industrial capital, mainly around the textile and mechanical industries. Their decline, from the 1960s onwards, led to a long period of crisis and it was not until the 1990s that the conversion to the tertiary sector and the rehabilitation of the disaster-stricken districts gave the city a different face. Today, the historic center, Old Lille, is characterized by its 17th century red brick town houses, its paved pedestrian streets and its central Grand'Place. The belfry is one of the 23 belfries in the Nord-Pas-de-Calais and Somme regions that were classified as UNESCO World Heritage Sites in July 2005.