"At the summit of Montmartre, the highest point in the city, you'll find the Basilica de Sacré-Cœur. Contrasting with the Gothic churches like Notre-Dame, the Romano-Byzantine architecture is both beautiful inside and out. While outside, take in the panorama of Paris and while inside, marvel at the Apse Mosaic—one of the largest mosaics in the world. The Sacré-Cœur website has instructions on how to download the free audio guide on your phone before your visit which is recommended. Also, research the well-known (and apparently tried-and-true) scams before traveling to Paris. Overall, the city seems pretty free of tourist scams, but around Sacré-Cœur especially, visitors should be on alert."