Yellowstone's vents, geysers, hot springs, and popping mud pots are interesting.
The last time I visited Yellowstone was before I knew it was a supervolcano, but that won't stop me from visiting it again.
But if that sucker blows again, we're all in for trouble.
From Brazilian artist Carol Rossetti's series Mulheres / Women:
(See a few more at Buzzfeed, or see the entire Women Project at the artist's website)