4 Best Sights in Paris, France

When this world-famous cabaret opened in 1889, aristocrats, professionals, and the working classes alike all flocked to ogle the scandalous performers (the cancan was considerably kinkier in Toulouse-Lautrec's day, when girls kicked off their knickers). There's not much to see from the outside except for tourist buses and sex shops; if you want to catch a show inside, ticket prices start at €113. Souvenir seekers should check out the Moulin Rouge gift shop (around the corner at 11 rue Lepic), which sells official merchandise, from jewelry to sculptures, by reputable French makers.

This mammoth ultramodern facility, designed by architect Carlos Ott and inaugurated in 1989, long ago took over the role of Paris's main opera house from the Opéra Garnier (although both operate under the same Opéra de Paris umbrella). The fabulous acoustics of the steeply sloping, stylish auditorium have earned more plaudits than the modern facade. Like the building, performances tend to be on the avant-garde side—you're as likely to see a contemporary adaptation of La Bohème as you are to hear Kafka set to music. Tickets for Opéra de Paris productions run €15–€230 and generally go on sale at the box office a month before shows, earlier by phone and online. Once the doors open, "standing places" can be purchased for €10 from vending machines in the lobby, but you'll need coins or a credit card (no bills) and patience to snag one, as the lines are long. The opera season usually runs September through July; the box office is open Monday through Saturday 11:30–6:30 and one hour before curtain call. If you just want to look around inside, you can also buy tickets for a 90-minute guided tour (in French only) for €17.

Haunt of the Phantom of the Opera and the real-life inspiration for Edgar Degas's dancer paintings, the gorgeous Opéra Garnier is one of two homes of the National Opera of Paris. The building, the Palais Garnier, was begun in 1860 by then-unknown architect Charles Garnier, who finished his masterwork 15 long years later, way over budget. Festooned with (real) gold leaf, colored marble, paintings, and sculpture from the top artists of the day, the opera house was about as subtle as Versailles and sparked controversy in post-Revolutionary France. The sweeping marble staircase, in particular, drew criticism from a public skeptical of its extravagance. But Garnier, determined to make a landmark that would last forever, spared no expense. The magnificent grand foyer is one of the most exquisite salons in France. In its heyday, the cream of Paris society strolled all 59 yards of the vast hall at intermission, admiring themselves in the towering mirrors. To see the opera house, buy a ticket for an unguided visit, which allows access to most parts of the building, including a peek into the auditorium. There is also a small ballet museum with a few works by Degas and the tutu worn by prima ballerina Anna Pavlova when she danced her epic Dying Swan in 1905. To get to it, pass through the unfinished entrance built for Napoléon III and his carriage (construction was abruptly halted when the emperor abdicated in 1870). On the upper level, you can see a sample of the auditorium's original classical ceiling, which was later replaced with a modern version painted by a septuagenarian Marc Chagall. His trademark willowy figures encircling the dazzling crystal chandelier—today the world's third largest—shocked an unappreciative public upon its debut in 1964. Critics who fret that Chagall's masterpiece clashes with the fussy crimson-and-gilt decor can take some comfort in knowing that the original ceiling is preserved underneath, encased in a plastic dome.

The Opéra Garnier hosts the Paris Ballet as well as a few operas each season (most are performed at the Opéra Bastille). Tickets cost €10–€230 and should be reserved as soon as they go on sale—typically a month ahead at the box office, earlier by phone or online; otherwise, try your luck last-minute. To learn about the building's history, and get a taste of aristocratic life during the Second Empire, take an entertaining English-language tour (daily at 11 am and 2:30 pm, €14) or rent an audioguide (€5) and proceed at your own pace. To complete the experience, dine at Coco—an over-the-top Belle Époque folie recalling the glamorous 1920s and helmed by chef Julien Chicoisne—or browse through the Palais Garnier gift shop for ballet-inspired wares, fine Bernardaud porcelain depicting the famous Chagall ceiling, a jar of honey from the Opéra's own rooftop hives, and an exceptional selection of themed DVDs and books.

Headquarters to France's state broadcasting company, this imposing, circular, 1963 building is more than 500 yards in circumference. It's said to have more floor space than any other building in the country and features a 200-foot tower that overlooks the Seine. Radio France sponsors 100-plus concerts a year, including performances by its own Orchestre Philharmonique de Radio France and the Orchestre National de France. Though the concerts take place at venues throughout the city, a great number are held here, and they're generally either free or inexpensive. French-only building tours are offered on various days at various times. Check the website for current information.