If you're planning a trip to Mesa Verde National Park this fall, one of the things you should consider is signing up for a backcountry hike with rangers to see some ruins that aren't typically seen by park visitors.

With hiking season in full swing, and more and more units of the National Park System are adding water filling stations, head to the parks with a water bottle from National Parks Traveler.

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.