In 1991, the banks of the Seine were declared a UNESCO cultural heritage site, and efforts began to make the highways and industrial space that remained along the river into a long promenade. Beginning in 2000, sections of the highways were closed on Sundays for promenades and jogging, and an artificial "beach" with sand and deck chairs was installed in summer. In 2008, during the administration of Mayor Bertrand Delanoë (2001-2014), the city of Paris began to transform portions of the highways built along the left and right banks of the Seine into parks and recreation areas.