Nice article. I'll been to four on that list and some that aren't. One of the main NP that most have seen or been to is the Grand Canyon. But wondering how many have been to the North Rim? I'll take it over the South Rim any time. Way less crowds, cooler, and all kinds of roads you can take & walk right out to the edge of the canyon & be the only one there.
Dirt road to explore & be the only ones
Great NF campground at Jacob Lake