I've been playing with an ultra-wide angle lens (10-20mm) and I'm loving it! This is an image taken inside the old Smithsonian Castle in Washington D.C. Ultra-wides present some interesting challenges but can be quite rewarding when you get it all sorted out. Ken Rockwell provides some great tips at How to Use Ultra-Wide Lenses.
Living atop the Shenandoah Mountain, I see my share of fog. It can be bright and sunny down in the valley, but it's not uncommon to have fog for a large part of the day in the Spring and Fall seasons. I know that many people don't like fog, but I love it. This low-flying cloud provides a velvety softness to the atmosphere as well as deadening almost all sound. This really gives a feeling of being in your own ethereal world.
I have struggled to capture the feeling of the fog in a photo. Most turn out as a subject with a gray featureless background. I think this one really nailed the feeling.