Dome of Basilique du Sacré-Coeur de Montmartre
The Basilique du Sacré-Coeur de Montmartre is one of the best-known landmarks of Paris: Located at the top of Butte Montmartre, the white church is visible from the whole city and, at 200m, its dome is one of the highest points of Paris. It houses an observatory accessible only by stairs but the view at the top is worth the effort.