New entrance, 100th anniversary 1871-1971

Famous Crystal Cave, Pennsylvania, new entrance. This great natural underground wonder discovered 1871, is located midway between Allentown & Reading just a short distance from US. #222 or #22-#78. Oldest operating cavern in eastern United States. Visited by thousands of persons annually. Guided tours, picnic park, new Dutch gift barn.
Courtesy of Boston Public Library