3 Best Sights in Montmartre, Paris

Built between 1136 and 1286, St-Denis Basilica is one of the most important Gothic churches in France. It was here, under dynamic prelate Abbé Suger, that Gothic architecture (typified by pointed arches and rib vaults) was said to have made its first appearance. The kings of France soon chose St-Denis as their final resting place, and their richly sculpted tombs—along with what remains of Suger's church—can be seen in the choir area at the east end. The basilica was battered during the Revolution; afterward, however, Louis XVIII reestablished it as the royal burial site by moving the remains of Louis XVI and Marie-Antoinette here to join centuries' worth of monarchical bones. The vast 13th-century nave is a brilliant example of structural logic; its columns, capitals, and vault are a model of architectural harmony. The facade, retaining the rounded arches of the Romanesque that preceded the Gothic period, is set off by a small rose window, reputedly the oldest in France. Check out the extensive archaeological finds, such as a Merovingian queen's grave goods. Occasional guided tours in English are offered (see website for exact times); if you'd rather explore on your own, audioguides are available for €3, as is a free English-language information leaflet.

This eye-catching church with a compact Art Nouveau interior was the first modern house of worship built in Paris (1897–1904) and the first to be constructed of reinforced cement. Architect Anatole de Baudot's revolutionary technique defied the accepted rules at the time with its use of unsupported masonry; critics, who failed to stop construction, feared the building would crumble under its own weight. Today the church attracts a steady flow of visitors curious about its unusual Moorish-inspired facade of redbrick and curved arches. Note the tiny clock at the top left of the bell tower and the handsome stained-glass windows. Free concerts and art exhibitions are staged in the church from time to time.

Tucked in the shadow of mighty Sacré-Coeur is one of the oldest churches in Paris. Built in 1147 on the site of a 5th-century temple to the god Mars, this small sanctuary with its impressive sculpted metal doors was once part of a substantial Benedictine abbey. Besides the church, all that remains is a small cemetery, now closed (you can see it through the ornate metal door on the left as you enter the courtyard). Renovated multiple times through the ages, Saint-Pierre combines various styles. Interior elements, such as the columns in the nave, are medieval; the facade dates to the 18th century, with renovations in the 19th century; and the stained-glass windows are 20th century. Maurice Utrillo's 1914 painting of the titular saint hangs in the Musée de l'Orangerie. Admission is free; English audioguides are €3.