"Fishing Cone", a hot spring on the shore of Yellowstone
Lake. Currently one of my favourite photos, despite (or
maybe because of) its fragrant violation of the "rule of
thirds", which says that your main subject should be placed
about 1/3 of the way across your image, not in the center.

1:41 pm, September 6th 2002
1/278 sec, f6.0, ISO 100, focal length 8.2 mm
Barrel distortion corrected with "panorama tools", color
balance adjusted, resampled.