 The two palaces were both built at the beginning of the 18th century, but the Hôtel de Soubise is more accessible and has less security than the Élysée.During the massive annual 14 July parade down the Champs-Élysées, the company was allowed to film inside the police lines, capturing extraordinary closeup footage of the massing of troops, tanks, and artillery during the final Liberation Day sequence.During the weekend of 15 August, the Paris police cleared a very busy square of all traffic to film additional scenes.