During the Art Nouveau period, Riga was a uncommon city: a wealthy port town, a centre for transit trade, an industrial city (airplanes, trains, cars, and bicycles factories were at work there): the richness of that time is reflected in the beauty of the buildings.
You can take a walk through the Old Town and enjoy all this Art Nouveau beauties. In another section of my page (Things to do), I'll list the most beautiful buildings I've seen.

