Mexico City , the most populous city in North America , is a vibrant, bustling metropolis that blends rich history with modern culture. Whether you are marveling at ancient ruins or enjoying contemporary art, there is a palpable energy in the air and it will be present during the World Cup this summer. With a metropolitan area of some 23.1 million people, traffic congestion is quite intense during rush hours, especially in the area near Azteca stadium. The city has pollution issues that could also be a problem for fans with respiratory conditions. Remember, too, that the city is at an altitude over 7,300 feet (2,240 meters), which may require some acclimatization for visitors. Landmarks/places to see Zócalo: One of the largest city squares in the world at some 14 acres (5.5 hectares), it is surrounded by the Metropolitan Cathedral and the National Palace. It’s a hub of activity and a great place to soak in the city’s history. It has been a gathering place for centureis.…