All through our lives, we witness and experience things where we know it's the last time. Being somewhere, being with someone, etc... those memories are recorded in our minds and rarely is it captured on film.
Upon my departure on the Exploratorium's last day at the Palace of Fine Arts, I turned 180 degress when I approached the extrance (that's an entrance and exit) way.
Thought about everything that happened to me during my time there.
Got teary eyed, raised my camera, took this final shot, said Thank You under my breath and walked away.