While hundreds of parks are free to enter, others use timed entry and other reservation methods to control crowds — but that also means you may need to secure your spot well in advance.

There are more than 400 national parks ... Pass is available to current military members and their dependents. It covers entrance fees to U.S. Fish and Wildlife Service and National Park Service ...

If you are a U.S. citizen or permanent resident 62 or older, you can still use your Senior Pass at any and all National Parks ...

Sovereign states typically designate their own national parks and are responsible for their general upkeep. Depending on the country and park, visitors from the general public may be charged an ...

A reader warns that long wait times at national parks will worsen this summer when more than 100 million visitors are ...

Tired of crowded national parks, or want something new? Here are less visited national parks in California, what months to ...