Answer:
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I have cities with no people, forests with no trees, and oceans with no water. What am I?
Though it be cold, I wear no clothes. The frost and snow I never fear. I value neither shoes nor hose and yet I wander far and near. What am I?
My rings are not worth much, but they do tell my age. What am I?
What is full of holes but still holds water?