One of continental Europe's tallest skyscrapers offers a stupendous view of Paris from its 56th-floor observation deck, and the upwardly mobile can climb another three flights to its open-air roof terrace. Completed in 1973, the 680-foot building attracts 800,000 gawkers each year because, on a clear day, you can see for 40 km (25 miles). Well-placed plaques and a glossy brochure, "Paris Vu d'en Haut" ("Paris from on High"), explain what to look for. Have a cocktail as you drink in the view at Le Bar Américain on the 56th floor, which also serves light food, or splurge on dinner in Le Ciel de Paris restaurant. Purchase tickets in advance to avoid lines.
Rue de l'Arrivée, Paris, 75014, France
/01–45–38–52–56; /01–40–64–77–64-Le Ciel de Paris