Like most cities, Poland's Krakow developed around and because of its favorable geography. Before Warsaw, Krakow served as Poland's capital for half a millennium. It has functioned as a cultural center, an industrial center, a center of learning, and home for millions of people. Behind all of this lies the city's environment: its fauna and plant life, the Vistula River, the surrounding countryside rich with resources, and man-made change that has...