GRAND CANYON NATIONAL PARK, Ariz. — Visitors heading to the Grand Canyon lately know they are going to get two things when they arrive: breathtaking views and long waits, whether it is to get into the national park itself or to find a parking spot inside. A few frustrated tourists have even turned around and left. The crowds haven't just been coming to the Grand Canyon, where a sign ahead of the entrance gates warns of limited parking. The throngs of tourists have been showing up in big numbers at other national parks, including Yellowstone in Wyoming, Yosemite in California and Zion in Utah, driven by good weather, cheap gas and marketing campaigns ahead of next year's National Park Service centennial. Read more on Colorado Springs Gazette