Niagara Falls – 48¢: This 48¢ stamp was issued in 1999 to pay the international postage rate. It is the first stamp in the Scenic American Landscapes Series. The stamp features a photo of the American Falls taken from the New York shoreline by nature photographer Kurt Ross. To the left of the stamp’s denomination is the stylized silhouette of a jet, which indicates it was intended to satisfy an airmail or international rate. Rio Grande – 40¢: The second installment in the Scenic American Landscapes Series honors the Rio Grande river. Its 40¢ denomination fulfills the 1999 international rate for a postcard mailed from the United States to Mexico. To the left of the stamp’s denomination is the stylized silhouette of a jet, which indicates it was intended to satisfy an airmail or international rate.