America's National Parks celebrate their centennial this year with special events, reduced prices, and a great new movie narrated by Robert Redford. The film was produced and directed by Greg MacGillivray, who guests on Travel Itch Radio March 3 with Dan Schlossberg and Christine Tibbetts. Listen live at 8p ET on iTunes or BlogTalkRadio.com as Greg tells how he chose the 40 parks represented in the movie, which had its debut at the American Museum of Natural History last month and is on a nationwide tour that should reach three million viewers.