Rail advocates worry that the administration wants to do away with Amtrak's long-distance trains, including the Empire Builder that travels along the southern border of Glacier National Park.

Climate science is just that, science, which ebbs and flows through the refinement of technology and physical observation. But the Trump administration's refusal to recognize the science its land-management agencies conduct neither ebbs nor flows; you could say it's frozen in place. Sadly, that clamp down is preventing a thorough discussion of what's going on with the glaciers at Glacier National Park.

When you visit national parks, do you find yourself focusing on a particular aspect of those parks? Maybe you are concentrating your photography on cactus blooms, or wildflowers, or the results of glacial geology, or a particular specimen of wildlife. What you are doing, in fact, is creating a theme to your national park photographic story. Photographer Rebecca Latson discusses themes and how they can improve your powers of observation as well as your photographic skills.

Last month we pointed to some of the frustrations that can be had when trying to navigate the overall NPS.gov domain. Let's now take a look at the individual haves and have-nots of the National Park System and some of the things that differentiate them.