Built out of a single block, Carrare's huge glass and white marble arch, designed by the Danish architect, Otto von Spreckelsen, is the final point of Paris's historical centreline: Louvre, Concorde, Arc de Triomphe. Panoramic lifts will take you to the roof where you will find galleries with exhibitions, bookshops and a extraordinary view from the panoramic viewpoint. The buildings are the offices of ministries and important companies.