At the crossroads of Center City, Philadelphia, stands city hall, an architectural and sculptural masterpiece whose size and beauty rival the grand structures found in the capitals of Europe. Shortly after the Civil War, city hall embraced the community's need for a new municipal building while filling the visionary desire of its designers to underscore Philadelphia's reputation as "the Athens of America." Thirty years later stood a monumental structure that was easily the largest building in North America and one of the most beautiful, displaying over two hundred fifty pieces of sculpture....