Book excerpt: One of the world's most remarkable outdoor art treasures lies hidden in plain sight along Chicago's Lake Michigan shoreline. For most of its length it is lined with thousands of works of art -- carvings in stone, many of them spectacular, most by anonymous creators, and almost none of them noticed by the millions of people who enjoy the city's unobstructed shore. This book documents some of the best of the carvings with a rich selection of photos, and it tells the story of the carvings, the carvers and the lakefront where they worked.