Newcomers to the "Mile-High City" of Denver, whether arriving during the 19th, 20th, or 21st centuries, have often remarked on how new the city seems, and how proud its citizens are of it. Heady boom times at various intervals have inspired successive waves of city builders eager to make their mark by building grand, new edifices. Often, these new wonders replaced older structures that earlier Denverites had once seen as great accomplishments. As Denver has grown to become the hub of a major American metropolis, remnants of its earlier heritage have vanished into history, leaving newcomers to...