1 Best Sight in Alsace-Lorraine, France

This busy boulevard lined with mansions was laid out for Nancy's affluent 19th- and early-20th-century middle class. At No. 69, built in 1902 by Émile André, the occasional pinnacle suggests Gothic influence; André designed the neighboring No. 71 two years later. Number 41, built by Paul Charbonnier in 1905, bears ironwork by Louis Majorelle.