The past year was very kind to me in terms of getting out to visit some of the incredible units of our National Park System. Here's a look back at a year in national parks.

More than a decade after non-native lake trout were discovered in Yellowstone Lake, the battle to beat down the population of those voracious fish continues. While gill-netting long has been used to cull the lake trout, Yellowstone National Park officials want to increase those operations to help native cutthroat trout survive the onslaught of the bigger fish.

Too many species, too little staff. That's the roadblock preventing the U.S. Fish and Wildlife Service from immediately adding the wolverine to the list of species with protection under the Endangered Species Act.

Yellowstone has Old Faithful, in Yosemite looms Half Dome, and Arches has Delicate Arch. Those are just three settings that are readily identified with national parks. But which view in the National Park System do you think is the most iconic of all when talk turns to parks?