Photo courtesy of NPS By Mary Forgione Los Angeles Times Daily Travel & Deal blogger August 24, 2012, 6:45 a.m. The National Park Service, the agency that overseas 397 national parks, battlefields, monuments, historic sites, seashores and even scenic byways, turns 96 on Saturday.Some parks are older than that — Yellowstone, the nation’s oldest park, was created in 1872 — and some are much younger. Gates of the Arctic National...