I believe that the beauty of D.C. is the simplicity of a good plan: symmetry, long vistas, and grand terminals. All of these qualities are found in the allée.
Here is a photo I took while walking the National Mall:
What I love about the allée is that it’s so simple. With a straight path and some lovely trees we could turn any formless green space into a memorable experience.
With the allée, a simple path becomes dramatic. A walk becomes an journey.