How many times have you walked around town, on your way to work, to school, back home. How many times have you gone to the library, to catch a train, to the neighborhood market. How many tours around the city could you travel with your eyes closed?
How many faces do you see every day?

Set out to explore your surroundings. 
Wander the usual path.
Notice the little things, find the invisible.

Enjoy the walk.