Locations
Yellowstone
Lower Falls
Yellowstone Park contains some very beautiful water falls. However, unless you time your visit perfectly, you're probably going to have to deal with bright sunlight and dark shade in the same scene. Photographic film simply can't handle the range from shade to bright sunlight.
The image at right was enhanced in the field by a 3 stop soft graduated neutral density filter. I had never used one before but I am now convinced that this may be even more useful than a polarizing filter in some situations.