#1 Sacré-Cœur Basilica
The Sacré-Cœur Basilica sits atop the Montmartre hill in Paris. Completed in the late 19th century, this landmark features Romano-Byzantine architecture and an 83-meter dome with expansive city views. Inside, find a massive mosaic of Christ in glory and a statue of Saint-Michel slaying the dragon. It remains a major site for pilgrims and travelers.