These photos are not posted for their aesthetic value, but just to show the rim of S P Crater, the volcano north of Flagstaff. The cone is so large that even with a wide-angle lens, two photos had to be combined to create the first image below. The second photo shows the cone's enormous depth. Most hikers probably wouldn't venture to the bottom for fear of getting stuck down there. What is most amazing about this natural wonder is that there is no paved road leading to its base and no trail leading to the summit. It's a an incredibly steep climb that takes about a half-hour. No tourists. No sidewalks. No visitors center. Just a giant volcano out in the middle of nowhere.

And here's a bit of trivia: "S.P." stands for "Shit Pie". Apparently, from an airplane, that's what the volcano looks like...but of course they can't print "Shit Pie" on a map so they initialize it.

Wikipedia has a nice arial photo of SP Crater and the lava field next to it...

http://en.wikipedia.org/wiki/SP_Crater