It seems not a week goes by without some dire issue being identified as a threat to the national parks. One week it might be funding woes, another week pollution, another diversity concerns, and then, of course, there's climate change.

The return of the Mystery Photo pulled this accompanying shot from our pool of candidates. Do you know not just what it is, but where in the National Park System you can find it for your own photo?

Decades of "bleaching" events and diseases have been devastating to coral reefs surrounding national parks in the Caribbean and off South Florida, so much so that the losses are akin to "losing the Redwoods."

A worm with a lot of body English might be good for fishing, but when it's an uninvited pest introduced to the forest duff of Great Smoky Mountains National Park, well, it's just bad news.