The Hudson River's unique navigational icons are celebrated in this collection of mailable vintage-photograph postcards. Set against the backdrop of purple mountains, lush hillsides, and tidal wetlands, the lighthouses of the Hudson River were built between 1826 and 1921 to improve navigational safety on a river teeming with freight and passenger traffic. Unlike the towering beacons of the seacoasts, these river lighthouses were architecturally diverse, ranging from short conical towers to elaborate Victorian houses. Operated by men and women who at times risked and lost their lives in service of safe navigation, these beacons have overseen more than a century of extraordinary technological and social change. Of the dozens of historic lighthouses and beacons that once dotted the Hudson River, just eight remain, including the iconic Statue of Liberty, New York Harbor's great monument to freedom and immigration, which served as an official lighthouse between 1886 and 1902.