Sacré-Coeur is one of Paris's most characteristic landmarks and has been the subject of much controversy. One Parisian called it "a lunatic's confectionery dream." An offended Zola declared it "the basilica of the ridiculous." Sacré-Coeur has had warm supporters as well, including poet Max Jacob and artist Maurice Utrillo. Utrillo never tired of drawing and painting it, and he and Jacob came here regularly to pray. Atop the butte (hill) in Montmartre, its multiple gleaming white domes and campanile (bell tower) loom over Paris like a 12th-century Byzantine church. But it's not that old. After France's 1870 defeat by the Prussians, the basilica was planned as a votive offering to cure France's misfortunes. Rich and poor alike contributed money to build it. Construction began in 1876, and though the church wasn't consecrated until 1919, perpetual prayers of adoration have been made here day and night since 1885. The interior is brilliantly decorated with mosaics: Look for the striking Christ on the ceiling and the mural of his Passion at the back of the altar. The stained-glass windows were shattered during the struggle for Paris in 1944 but have been well replaced. The crypt contains what some of the devout believe is Christ's sacred heart -- hence, the name of the church.

Insider's tip: Although the view from the Arc de Triomphe is the greatest panorama of Paris, we also want to endorse this view from the gallery around the inner dome of Sacré-Coeur. On a clear day your eyes take in a sweep of Paris extending for 48km (30 miles) into the Ile de France. You can also walk around the inner dome, an attraction even better than the interior of Sacré-Coeur itself.