If you find yourself homebound for one reason or other this winter, there are two websites worth exploring for a quick national park fix: the National Park Service’s Treasured Landscapes site (which showcases art collections telling America’s stories) and the Open Parks Network (“350,000 cultural heritage objects and 1.5 million pages of gray literature...”). That’s a lot of information.

Mammoth Cave National Park, which is celebating its 75th birthday this year, and the Friends of Mammoth Cave are planning some special activities to mark National Public Lands Day on September 24.

Running more than 160 pages, the National Park Service Management Policies provides park managers with quick reference to how they are to manage their units, what uses are appropriate, and how to usher visitors out of the park when Congress fails to fund the National Park Service. But the Management Policies, which last were updated in 2006, also leave much to interpretation and exception.

How do you decide on a vacation destination? Which route to take, attractions to visit and where to spend the night? No doubt you use online info. Star-ratings. Pics. Travel blogs. Information is short and to the point, like this 2015 review of Mammoth Cave: