When John Muir traveled in 1879 to the landscape now embraced by Glacier Bay National Park and Preserve in Alaska, his great desire to see its bay and surrounding glaciers was confounded by overcast skies and rain with some snow mixed in. But when the weather took a change for the better, he was astounded by the view.

I stumbled across a video the other day that further convinced me that I need to move Gates of the Arctic National Park higher on my to-do list. In it, two septuagenarians set off on a three-week canoe trip down the Noatak River, a river the park staff tells us "drains the largest mountain-ringed river basin in America that is still virtually unaffected by human activities."

One of the most incredibly beautiful birds you'll find in Everglades National Park is the Purple Gallinule. Unless you see a Roseate spoonbill. Or maybe a Tri-colored heron. Or a ..., well, you get the idea. There are an amazing number of gorgeous, and more common, bird species in the park. But time is running out to easily spot many of them, as the rainy season isn't too far off.

The dogs were large, with pointy ears, and they appeared suddenly along the cobbled path, barking furiously. My husband Paul and I paused, then slowly crept past them as we murmured pet-friendly reassurances at their bared teeth. They jumped around a bit but did not draw nearer; all bark, no bite. A cheerful man hobbled down the path on his cane, reaffirming this in Portuguese and gestures and tone that conveyed his meaning to our linguistically challenged ears. Chuckling, he waved us on our way from the tiny stone village into a sparse forest in Portugal’s sole national park—Peneda-Gerês.