Take saguaros out of Saguaro National Park, and you’d lose more than the park’s namesake cactus, one that gives skyward structure to the vista here. You might strain to catch the drumming of the Gila woodpecker, fail to catch an elf owl peering out from its cavity nest, and not know where to look for Lesser long-nosed bats. All these creatures rely on the saguaro for food and shelter. Realizing those possible losses to this Sonoran Desert landscape begs the question, "How are the park’s saguaros doing?"

Hiking a portion of the Ice Age Trail, the entire length of which is in Wisconsin, is reason enough to visit our nation’s 23rd state. Having the trail twist and turn through a land filled with cheese curds and Spotted Cow is a major bonus.

What comes to mind when you hear the words “base camp?” Tents beneath Mount Everest, perhaps? How about something a little closer to home, bordering the incredible turquoise-hued water of Diablo Lake in Ross Lake National Recreation Area, beneath the mountains of the North Cascades? Photographer Rebecca Latson spent a couple of nights at the North Cascades Institute Environmental Learning Center's "Base Camp" and writes about her experience.

With the arrival of summer, the national parks begin to fill with RVs, minivans, SUVs, and tour buses. Fifty years ago, Americans in their wood-paneled station wagons might linger in a national park for a week or two, but today many visitors try to tag as many parks as possible on their too-short vacations. Except at Isle Royale, that is.