Yellowstone is famous for its geothermic activity and even though we didn't have time to see Old Faithful, we did manage to find some stinky, boiling mud. The steam and escaping gases were interesting, but hard to photograph well. This is as good as I could manage.
BWLandscapeWyomingblack and whitefallmonochromemudnaturetravelvacationwest
From Wyoming 2014