We're more or less living on a volcano ourselves; only, it's long dead. This is a different thing altogether. The volcanoes in this park may be long dead but certainly don't look that way: It's Alive!
Never saw anything remotely like this before. From photographs I'd seen told Willy "Looks like the aftermath of an H-bomb explosion." Not at all the right description. So what is? Look for yourself, maybe you'll find one. (I hope to be better at pictorial descriptions.)
even with panorama stitching, I just could not fit this immense crater in one frame - too close for comfort
and what never fails to get to me, the plants will take over and, eventually, win