Gothenburg, Sweden

Officially founded by King Gustav II Adolph around 1620, Gothenburg's roots go back as far as the 11th century. Now Sweden's second-largest city and busiest port, the city has a population of just under half a million. Home to the Volvo automobile plant, Gothenburg's other industries include ship maintenance, brewing and distilling, textiles and cabinet making. Its cathedral, Gustavii Domkyrka, dates back to 1633, while its Opera House was just opened in 1994.