The Cathedral of Our Lady Immaculate

Visited by both the princely family and locals alike, the Cathedral of Our Lady Immaculate is Monaco’s spiritual heart. Built during the reign of Prince Charles III, construction began in 1875 and was completed in 1903, replacing the old Church of Saint Nicholas. That earlier church had served both the City-State and the Diocese of Nice for six centuries—until their official separation in 1868. Eight years after its inauguration, the new cathedral was finally consecrated. This impressive structure measures 72 meters long, 22 meters wide, and 18 meters high. It welcomes Monegasque worshippers—and visitors from around the world—every single day. Its architecture blends Romanesque strength with graceful Byzantine curves, a style deeply inspired by the forms of ancient Constantinople. The whole building gleams with brilliant white stone from nearby La Turbie. Step inside and you’ll find a richly decorated interior. One of its jewels is the stunning altarpiece painted in 1500 by Louis Bréa, depicting Saint Nicholas. There’s also the white Carrara marble altar, and the magnificent Great Organ by Jean-Loup Boisseau, installed in 1976 and made up of no fewer than 7,000 pipes. Beyond its artistic beauty, the Cathedral of Our Lady Immaculate has also been the setting for many of Monaco’s most significant events—both joyful and solemn. The most unforgettable, of course, is the 1956 wedding of Prince Rainier III and Hollywood legend Grace Kelly. United in life and in marriage, Grace Kelly and Prince Rainier III now rest side by side in the cathedral. Their tombs, among other princely graves, are open to the public. Whether you’re here to take a photo, light a candle, or simply take a moment to reflect, this cathedral is a cornerstone of Monegasque identity—and a moving place to visit.