Having been in the habit of spending a lot of time outdoors in the woods on my feet during the last few years, it is instinctive for me to look up to enjoy my surroundings.
Taken to an extreme one can look directly up a tree. A clear blue sky, either through the leafless branches of a tree in winter, or through the greenery of the leaves of the many trees in summer is memorable.
One can also look forwards and upwards into the distance on a trail to capture a perspective like this.
Sometimes you do not have to look up that far to ahead of you to observe something notable above you and around you.
If I had not looked up I would have missed the northern flicker in the following picture,
or the red-headed woodpecker in this one.
Sometimes you look up to the sight of something simple like these birds on a wire, seemingly in some form of communication with each other,
or you might see a sight like this Norfolk Southern locomotive crossing the Potomac on a trestle bridge looking distinctive in the early morning light.
If you do not look up you could miss the great blue heron that flies high over the Monocacy Aqueduct,
or the small and colorful aircraft that lights up the cloudless sky over the river.
Don’t forget to look up!
Splattered Brains 
What a great collection of photos. Since I am a “bird nerd” I especially like the bird photos.
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