63 Best Sights in Paris, France

This tiny shrine in the shadow of Notre-Dame is one of the three oldest churches in Paris. Founded in 1045, it became a meeting place for university students in the 12th century and was Dante's church of choice when he was in town writing his Divine Comedy. Today's structure dates mostly from the 1600s, but keep an eye out for older pillars, which crawl with carvings of demons. You can maximize your time inside by attending one of the classical or gospel concerts frequently held here. Alternately, go outside and simply perch on a bench in the lovely garden and gaze across the Seine at the newly restored Notre Dame.

You can't miss the unusual lacy spire of this church as you approach Île St-Louis; it's the only church on the island and there are no other steeples to compete with it. It was built from 1664 to 1726 according to the Baroque designs of architect François Le Vau, brother of the more famous Louis, who designed several mansions nearby—as well as the Palace of Versailles. Saint-Louis's interior was essentially stripped during the Revolution, as were so many French churches, but look for the odd outdoor iron clock, which dates from 1741. Check the church website for upcoming classical music events.

The leading Baroque church in the Marais, its dome rising 180 feet above the crossing, was begun in 1627 by the Jesuits, who modeled it after their Gesù church in Rome. Recently cleaned on the outside but dark and brooding inside, it contains Delacroix's Christ on the Mount of Olives in the transept and a shell-shape holy-water font at the entrance. The font was donated by Victor Hugo, who lived in nearby Place des Vosges. Hugo's beloved daughter, Léopoldine, was married here in 1843, though she met a tragic end less than seven months later, when she fell into the Seine and drowned, along with her husband Charles, who tried to save her.