tbsteph wrote in post #12854193
Tough question since so many offer a multitude of photo opportunities. Arches would certainly be high on my list. Utah offers several others such as Bryce Canyon, Canonlands, Castle Reef etc.
Some of my other favorites would be the Colorado Monument, Mesa Verde, Grand Canyon (Particularly the North rim), Monument Valley, Badlands (SD), White Sands, NM and the Smokies. If you want to include areas that are not a national park, I would add the Columbia River Gorge (Weather permitting).
I am with you on the CRG (columbia river gorge), but it is a National Scenic Area, not a park. It would be simply too hard to make it a NP as the I-84 runs right through it. Weather is good ALL year round
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As for me, I would say (and in particular order) Mt. Rainier National Park, Olympic National Park, Grand Canyon, and Crater Lake. I haven't been to many others, so I cannot comment. Petrified Forest is pretty cool though. It doesn't get a lot of love as it is pretty far off the beaten path.. Redwoods and Joshua Tree are cool as well.