Craters of the Moon National Monument, Idaho
Earlier this month (May 2014) I spent a few nights at the Craters of the Moon National Monument near Arco, Utah. The monument is in an isolated area; Arco is the nearest town, about twenty miles away. The monument encloses a volcanic lava field and cinder cones, and contains a sightseeing loop that one can drive to view various volcanic formations. There are also hiking trails. The campground is near the visitors center. The camping sites have no hookups; there are a few pull-thru sites but many are back-in. It cost six dollars per night to camp, and this is not a senior discount.
The area is interesting geologically, but for photography one might want to visit when it is colder, with snow on the ground for contrast with the black volcanic rock. There is some wildlife-- hawks and other birds, and the area contains a migration route for mule deer.
One thing to beware of is wind blowing volcanic ash. I left my windows open and it got all over my trailer. The ash is abrasive and I guess it can't be good for machines or people, though I saw no warning signs.