For 50 years, U.S. marine sanctuaries and marine national monuments have protected areas with special ecological, cultural and historical significance. Each of the 16 stamps on the pane features a photograph from a site that is part of the National Marine Sanctuary System, showcasing just some of our nation's precious natural treasures. A map of the National Marine Sanctuary System is printed on the back of the pane. Art director Greg Breeding designed the pane using existing photographs and a newly illustrated map.