Despite advances made into the 21st century, some of the most striking posters promoting the national parks are those produced shortly before World War II by the Works Progress Administration. The artistry that went into these silk-screened promotions remains as striking today as it was 75 years ago. And if you find yourself in Washington, D.C., in the coming months, you can understand why with a visit to the Interior Department to see a collection of the posters.

What exists within the place known as the "Inner Gorge" of Grand Canyon National Park? The following video follows three scientists as they explore springs spouting from deep within this section of the park.

A law authorizing the Huna Tlingit to harvest glaucous-winged gull eggs in their traditional homeland of Glacier Bay National Park and Preserve in Alaska has been signed by President Obama.

The El Portal wildfire that flared up several days ago from unknown causes had burned more than 3,000 acres along Yosemite National Park's western border by Tuesday and was just 19 percent contained, but the park remained open for visitors.