Once known as the Steel City, sometimes even the Smoky City, Pittsburgh is now a vibrant, flourishing metropolis that's routinely rated among the most livable cities in the United States. It's a place that's firmly established as a leading center of health care, biomedical research and development, robotics, finance and, yes, even tourism.To be sure, Pittsburgh has always served as a mecca for sports fans. Sports aren't all that define the town, though. In Pittsburgh, there's also a strong commitment to learning and the arts. Similar commitments to quality of life can be felt in other facets of the day-to-day, most visibly in the many public green spaces, parks and riverside trails maintained throughout the city's hilly landscape. From many of these areas, walkers, joggers and bikers are treated to spectacular views of a skyline that's scene sleek, towering glass and steel architecture is a dramatic departure from the days when the grey cloud of industry loomed over the 'Burgh. .