Located in Pennsylvania, Pittsburgh is one of the oldest cities in the nation.

In the newer area you will find excellent hotels, chic shops, and good restaurants. Near the old downtown commercial center, behind the Catedral Metropolitana, and a block off Central Park, the Central Market where everything made or produced in the country is sold.

One of the major rivers of the Iberian Peninsula, the Douro in north-central Spain and Portugal just might be the world's most beautiful wine region. Most of the river on the Spanish side isn't navigable, so river cruises generally travel roundtrip from Porto, on the coast of the Atlantic.

Guanajuato is situated between the dry north of the country and the more verdant south, and geographically belongs to the Trans-Mexican Volcanic Belt, the Mexican Plateau.

Even though Linköping has developed into an industrial center and is Sweden's fifth-largest city, it maintains a small-town atmosphere. Old Linköping is the restored town center with preserved buildings from the 18th and 19th centuries. The tower of the impressive Linköping Cathedral, which took nearly 300 years to complete, can be seen from a distance of more than 10 kilometers.