The Ancient Theater and the Museum of Art and History are open daily from 9:30 am to 4:30 pm. The sound tour of the Arc de Triomphe is open daily from 9 am to 8:30 pm. The Théâtre Antique is closed on January 22 and 23 for the installation of the new ticket office-boutique. The Musée d'art et d'histoire is closed on January 21 and 23 for the installation of the new ticket office-boutique.