Guided tours «Les Halles d'hier à aujourd'hui»: the transformation project of the former Alstom halls is one of the major structuring projects of the Nantes metropolis. The nerve centre of the creative district, the Les Halles project closed this year the last chapter of its realization, with the opening of Les Halles 1&2. This set of 5 autonomous projects thus becomes a pole of excellence of the knowledge economy but also a real place of life and culture open to all audiences.