As the National Park Service celebrates its centennial ... here are the country's best parks for wildlife watching. (Getty Images)| Alaska Though the park shares a name with the mighty mountain ...

Click through the gallery as we step back in time to see what some of the world's best national parks used to look like ...

The Golden State has the most national parks of any state in the U.S. and ... military-like camps across the United States. Manzanar, located between Kings Canyon National Park and Death Valley ...